Shifting between bemols (flats) and diesis (sharps)in the key signatureHow can I easily translate between a key and a key signature?Collective word for sharps and flats in the key signatureHow to determine what key changes are appropriate?What use is knowing how many sharps or flats a key signature has?Double Sharps And Double FlatsIs it harder to play in a key with more flats or sharps?Correctly notating sharps and flatsTheory vs PracticeAre all modes/scales in a given key signature perceived as equally bright/dark?How to easily transpose sheet music?

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Shifting between bemols (flats) and diesis (sharps)in the key signature


How can I easily translate between a key and a key signature?Collective word for sharps and flats in the key signatureHow to determine what key changes are appropriate?What use is knowing how many sharps or flats a key signature has?Double Sharps And Double FlatsIs it harder to play in a key with more flats or sharps?Correctly notating sharps and flatsTheory vs PracticeAre all modes/scales in a given key signature perceived as equally bright/dark?How to easily transpose sheet music?













5















I am a beginner in music with little knowledge, but like once in a month spend a little time playing with a digital keyboard.



I noticed that if I have some notes of a song which got 4# in the beginning of the stave, I can play the song like there is 3♭ instead. The same happens if I have 4 bemols (flats) then I can play the song like it has 3 diesis (sharps) (yes, it will sound a bit higher, but not that different).



I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?










share|improve this question









New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.















  • 4





    For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

    – Todd Wilcox
    Mar 10 at 19:04











  • A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

    – Zacky
    Mar 10 at 19:14






  • 7





    So that’s just “flat” and “sharp”, respectively?

    – Todd Wilcox
    Mar 10 at 19:25











  • Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

    – Zacky
    Mar 10 at 19:27






  • 2





    Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

    – Joshua
    2 days ago















5















I am a beginner in music with little knowledge, but like once in a month spend a little time playing with a digital keyboard.



I noticed that if I have some notes of a song which got 4# in the beginning of the stave, I can play the song like there is 3♭ instead. The same happens if I have 4 bemols (flats) then I can play the song like it has 3 diesis (sharps) (yes, it will sound a bit higher, but not that different).



I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?










share|improve this question









New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.















  • 4





    For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

    – Todd Wilcox
    Mar 10 at 19:04











  • A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

    – Zacky
    Mar 10 at 19:14






  • 7





    So that’s just “flat” and “sharp”, respectively?

    – Todd Wilcox
    Mar 10 at 19:25











  • Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

    – Zacky
    Mar 10 at 19:27






  • 2





    Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

    – Joshua
    2 days ago













5












5








5








I am a beginner in music with little knowledge, but like once in a month spend a little time playing with a digital keyboard.



I noticed that if I have some notes of a song which got 4# in the beginning of the stave, I can play the song like there is 3♭ instead. The same happens if I have 4 bemols (flats) then I can play the song like it has 3 diesis (sharps) (yes, it will sound a bit higher, but not that different).



I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?










share|improve this question









New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I am a beginner in music with little knowledge, but like once in a month spend a little time playing with a digital keyboard.



I noticed that if I have some notes of a song which got 4# in the beginning of the stave, I can play the song like there is 3♭ instead. The same happens if I have 4 bemols (flats) then I can play the song like it has 3 diesis (sharps) (yes, it will sound a bit higher, but not that different).



I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?







theory key key-signatures






share|improve this question









New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 days ago









user45266

3,4201734




3,4201734






New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked Mar 10 at 18:16









ZackyZacky

1266




1266




New contributor




Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Zacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







  • 4





    For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

    – Todd Wilcox
    Mar 10 at 19:04











  • A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

    – Zacky
    Mar 10 at 19:14






  • 7





    So that’s just “flat” and “sharp”, respectively?

    – Todd Wilcox
    Mar 10 at 19:25











  • Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

    – Zacky
    Mar 10 at 19:27






  • 2





    Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

    – Joshua
    2 days ago












  • 4





    For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

    – Todd Wilcox
    Mar 10 at 19:04











  • A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

    – Zacky
    Mar 10 at 19:14






  • 7





    So that’s just “flat” and “sharp”, respectively?

    – Todd Wilcox
    Mar 10 at 19:25











  • Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

    – Zacky
    Mar 10 at 19:27






  • 2





    Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

    – Joshua
    2 days ago







4




4





For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

– Todd Wilcox
Mar 10 at 19:04





For those of us who only know English, I wonder if it would help to explain what a "bemol" and what a "diesi" is.

– Todd Wilcox
Mar 10 at 19:04













A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

– Zacky
Mar 10 at 19:14





A bemol is the symbol that tell us that we have to decrease the note by a semi-tone, whereas a diesis increases a note by a semi-tone.

– Zacky
Mar 10 at 19:14




7




7





So that’s just “flat” and “sharp”, respectively?

– Todd Wilcox
Mar 10 at 19:25





So that’s just “flat” and “sharp”, respectively?

– Todd Wilcox
Mar 10 at 19:25













Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

– Zacky
Mar 10 at 19:27





Yes, it is. en.wikipedia.org/wiki/Sharp_(music)

– Zacky
Mar 10 at 19:27




2




2





Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

– Joshua
2 days ago





Incidentally, wikitonary found bemol as English for some reason I cannot comprehend: en.wiktionary.org/wiki/bemol#English

– Joshua
2 days ago










4 Answers
4






active

oldest

votes


















19














I'm not aware of a name for this phenomenon, it's just a quick way to transpose music based on how the tonal system works out.



In short, when you're in a key, look at the key signature. Take the number of accidentals in the key and replace them with the mod-7 complement of the other accidental type and you're left with a key built a half step away from the original tonic.



So you're in E major with 4 sharps. Let's take the mod-7 complement of the other accidental type: 7-4=3, so we're left with 3 flats, which is E♭ major, one half step away from the original tonic of E.



You're now asking about 2 flats in the key signature; this is B♭ major. 7-2=5, so a key of 5 sharps will be B major.



This trick is especially fun in C, which has 0 sharps or flats. The mod-7 complement of 0 is 7, so if we have 7 sharps in the key signature, we're in C♯ major; 7 flats makes it C♭ major!



Note that this trick isn't exclusive to major; it works for minor keys as well.



Lastly, know that this works perfectly until you encounter accidentals in the music; you'll have to have a more contextual understanding of those accidentals to know how they should be interpreted in your new key.






share|improve this answer























  • Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

    – Zacky
    Mar 10 at 18:29












  • @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

    – badjohn
    Mar 10 at 20:01






  • 2





    +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

    – Tim
    Mar 10 at 20:02






  • 2





    @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

    – badjohn
    Mar 10 at 20:15






  • 1





    @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

    – phoog
    2 days ago



















5














This is a consequence of the key signatures. Basically, what you're doing is changing the number of accidentals in the key signature by seven (some would argue that's an oxymoron, but you all know what I mean). It turns out that by doing this, you've transposed the song into the key a half-step up. If you want the same exact key, you can add or subtract 12, but that makes for some ugly key signatures.



It's pretty intuitive; change the number of accidentals by seven, and you lower or raise every note by a half-step. That's the definition of how to transpose by a half-step!






share|improve this answer























  • On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

    – supercat
    2 days ago






  • 1





    More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

    – Rosie F
    2 days ago


















5














When you describe this kind of key relationship, I just "get it," because I know the key signatures well enough. But I really wanted to know why or how this relationship exists.



Below is a chart I drew showing the circle of fifths (and circle of fourths) but arranged as a line. I'm not sure this will help you, but it shows the key 'symmetries' with keys paired up according to the funny modulus math @Richard describes in his answer.



I like visuals and made the chart for myself last night. (I couldn't get to sleep after reading this post and had to make the chart just to clear my head!) Maybe it will be helpful or interesting to you...



enter image description here



The middle number row 0-11 is both the position on the circle of fifths/fourths and the number of sharps or flats in the key signature.



When you go past the two dashed line boundaries - beyond the area I labelled the _7 letter gamut - you get into the weird enharmonically complex keys. You can get the modulus math to work in this region by adding a _negative number (bottom row) which represents going backwards on the circle of fifths. Ex. E#/F at position 11 and Fb/E at position -4, 11 + -4 = 7.



When all 12 chromatic pitch classes are arranged by perfect fifths and numbered 0-11, the basic sequence for a major scale - starting on C - is 0,2,4,11,1,3,5. All the other keys signatures are transpositions of that numeric sequence on the circle. For example, just add 2 to each position to get D major (remember that 11 will circle back around to 0 the 1.)



At the bottom of the chart is a sort of test that the numbering in the enharmonically complex area outside the gamut is true. As bizarre as it is to say 'Eb major is 9 sharps' is mathematically true.



Finally, the is a kind of geometric symmetry of scale for each position along the circle. Any major key in the sharp keys shares mirror symmetry with the corresponding flat key's fifth mode of the relative minor. It's easier to explain by example: at position 3 A major A to A ascending shares a mirror symmetry with C minor (Eb's relative minor) G to G descending. You can test that on the keyboard as see how the two scales are inversions sharing the same sequence of whole and half steps and the same sequence of white and black keys.



There isn't a specific musical term for all this, but when you write out the circle of fifths as a circle of counting line or compare the inversions of scales you have a kind of mathematical symmetry.






share|improve this answer
































    3















    I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?




    There isn’t a name for this phenomen. But we can find one. In German I would call them “gleichnamige” Tonarten, in English this would be “same named” keys.
    (Now, as we know they are not exactly the same name, as the “related” key*1) has added a -bemol (flat) and is a half tone lower!)



    The phenomen can be explained quite simply by the circle of fifths and by the tones of the twelve
    tone scale (fixed do names!)



    Do, Re-bemol, Re, Mi-bemol, Mi, Fa, Fa#/Sol-bemol, Sol, La-bemol, La, Si-bemol, Si.



    Of each tone of the doremi scale exist two keys: one on the -bemol site (flats) and the -diesis (sharps) site. The two keys with the same name are differing logically a minor second respectively 7 fifths
    and can be played by exchanging the amount of # with the amount of b of its same named (“related”) key:



    enter image description here



    So this “related” keys in question are:



    Si-bemol (2bemol) and Si (5#)



    analogically we get (starting with Re-bemol):



    Re-bemol and Re



    La-bemol and La



    Mi-bemol and Mi



    Si-bemol and Si



    Fa and Fa#



    Do and Do# (Re-bemol)



    Sol and Sol# (La-bemol)






    share|improve this answer






















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      4 Answers
      4






      active

      oldest

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      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      19














      I'm not aware of a name for this phenomenon, it's just a quick way to transpose music based on how the tonal system works out.



      In short, when you're in a key, look at the key signature. Take the number of accidentals in the key and replace them with the mod-7 complement of the other accidental type and you're left with a key built a half step away from the original tonic.



      So you're in E major with 4 sharps. Let's take the mod-7 complement of the other accidental type: 7-4=3, so we're left with 3 flats, which is E♭ major, one half step away from the original tonic of E.



      You're now asking about 2 flats in the key signature; this is B♭ major. 7-2=5, so a key of 5 sharps will be B major.



      This trick is especially fun in C, which has 0 sharps or flats. The mod-7 complement of 0 is 7, so if we have 7 sharps in the key signature, we're in C♯ major; 7 flats makes it C♭ major!



      Note that this trick isn't exclusive to major; it works for minor keys as well.



      Lastly, know that this works perfectly until you encounter accidentals in the music; you'll have to have a more contextual understanding of those accidentals to know how they should be interpreted in your new key.






      share|improve this answer























      • Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

        – Zacky
        Mar 10 at 18:29












      • @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

        – badjohn
        Mar 10 at 20:01






      • 2





        +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

        – Tim
        Mar 10 at 20:02






      • 2





        @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

        – badjohn
        Mar 10 at 20:15






      • 1





        @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

        – phoog
        2 days ago
















      19














      I'm not aware of a name for this phenomenon, it's just a quick way to transpose music based on how the tonal system works out.



      In short, when you're in a key, look at the key signature. Take the number of accidentals in the key and replace them with the mod-7 complement of the other accidental type and you're left with a key built a half step away from the original tonic.



      So you're in E major with 4 sharps. Let's take the mod-7 complement of the other accidental type: 7-4=3, so we're left with 3 flats, which is E♭ major, one half step away from the original tonic of E.



      You're now asking about 2 flats in the key signature; this is B♭ major. 7-2=5, so a key of 5 sharps will be B major.



      This trick is especially fun in C, which has 0 sharps or flats. The mod-7 complement of 0 is 7, so if we have 7 sharps in the key signature, we're in C♯ major; 7 flats makes it C♭ major!



      Note that this trick isn't exclusive to major; it works for minor keys as well.



      Lastly, know that this works perfectly until you encounter accidentals in the music; you'll have to have a more contextual understanding of those accidentals to know how they should be interpreted in your new key.






      share|improve this answer























      • Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

        – Zacky
        Mar 10 at 18:29












      • @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

        – badjohn
        Mar 10 at 20:01






      • 2





        +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

        – Tim
        Mar 10 at 20:02






      • 2





        @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

        – badjohn
        Mar 10 at 20:15






      • 1





        @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

        – phoog
        2 days ago














      19












      19








      19







      I'm not aware of a name for this phenomenon, it's just a quick way to transpose music based on how the tonal system works out.



      In short, when you're in a key, look at the key signature. Take the number of accidentals in the key and replace them with the mod-7 complement of the other accidental type and you're left with a key built a half step away from the original tonic.



      So you're in E major with 4 sharps. Let's take the mod-7 complement of the other accidental type: 7-4=3, so we're left with 3 flats, which is E♭ major, one half step away from the original tonic of E.



      You're now asking about 2 flats in the key signature; this is B♭ major. 7-2=5, so a key of 5 sharps will be B major.



      This trick is especially fun in C, which has 0 sharps or flats. The mod-7 complement of 0 is 7, so if we have 7 sharps in the key signature, we're in C♯ major; 7 flats makes it C♭ major!



      Note that this trick isn't exclusive to major; it works for minor keys as well.



      Lastly, know that this works perfectly until you encounter accidentals in the music; you'll have to have a more contextual understanding of those accidentals to know how they should be interpreted in your new key.






      share|improve this answer













      I'm not aware of a name for this phenomenon, it's just a quick way to transpose music based on how the tonal system works out.



      In short, when you're in a key, look at the key signature. Take the number of accidentals in the key and replace them with the mod-7 complement of the other accidental type and you're left with a key built a half step away from the original tonic.



      So you're in E major with 4 sharps. Let's take the mod-7 complement of the other accidental type: 7-4=3, so we're left with 3 flats, which is E♭ major, one half step away from the original tonic of E.



      You're now asking about 2 flats in the key signature; this is B♭ major. 7-2=5, so a key of 5 sharps will be B major.



      This trick is especially fun in C, which has 0 sharps or flats. The mod-7 complement of 0 is 7, so if we have 7 sharps in the key signature, we're in C♯ major; 7 flats makes it C♭ major!



      Note that this trick isn't exclusive to major; it works for minor keys as well.



      Lastly, know that this works perfectly until you encounter accidentals in the music; you'll have to have a more contextual understanding of those accidentals to know how they should be interpreted in your new key.







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Mar 10 at 18:25









      RichardRichard

      42.9k697185




      42.9k697185












      • Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

        – Zacky
        Mar 10 at 18:29












      • @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

        – badjohn
        Mar 10 at 20:01






      • 2





        +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

        – Tim
        Mar 10 at 20:02






      • 2





        @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

        – badjohn
        Mar 10 at 20:15






      • 1





        @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

        – phoog
        2 days ago


















      • Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

        – Zacky
        Mar 10 at 18:29












      • @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

        – badjohn
        Mar 10 at 20:01






      • 2





        +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

        – Tim
        Mar 10 at 20:02






      • 2





        @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

        – badjohn
        Mar 10 at 20:15






      • 1





        @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

        – phoog
        2 days ago

















      Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

      – Zacky
      Mar 10 at 18:29






      Thank you! Give me a little time to digest it because I am using Do-Re-Mi-Fa system not C-D-E one so I need to corellate, but I will come back later.

      – Zacky
      Mar 10 at 18:29














      @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

      – badjohn
      Mar 10 at 20:01





      @Zacky You will need to swap C for Do, D for Re, etc but otherwise the answer should work.

      – badjohn
      Mar 10 at 20:01




      2




      2





      +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

      – Tim
      Mar 10 at 20:02





      +1. Usual thorough answer! It's just mathematical serendipty, but useful. I often used to start a song in Eb and modulate to E by 'changing the key sig.'. Same with Ab and A. They seem to be the simplest 'mod-7'.

      – Tim
      Mar 10 at 20:02




      2




      2





      @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

      – badjohn
      Mar 10 at 20:15





      @Tim In the fixed do system, can't we just regard do as a translation of C, re or D etc. If I read "mi bémol majeur" in French, I just think "E♭ major". For example: fr.wikipedia.org/wiki/Symphonie_n%C2%BA_3_(Beethoven).

      – badjohn
      Mar 10 at 20:15




      1




      1





      @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

      – phoog
      2 days ago






      @Zacky movable do is the system in which the tonic of any major key or the third scale degree of any minor key is called "do." Fixed do is the system in which the key that is three half-steps above 440 Hz (the one with a letter name of "c") is called do.

      – phoog
      2 days ago












      5














      This is a consequence of the key signatures. Basically, what you're doing is changing the number of accidentals in the key signature by seven (some would argue that's an oxymoron, but you all know what I mean). It turns out that by doing this, you've transposed the song into the key a half-step up. If you want the same exact key, you can add or subtract 12, but that makes for some ugly key signatures.



      It's pretty intuitive; change the number of accidentals by seven, and you lower or raise every note by a half-step. That's the definition of how to transpose by a half-step!






      share|improve this answer























      • On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

        – supercat
        2 days ago






      • 1





        More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

        – Rosie F
        2 days ago















      5














      This is a consequence of the key signatures. Basically, what you're doing is changing the number of accidentals in the key signature by seven (some would argue that's an oxymoron, but you all know what I mean). It turns out that by doing this, you've transposed the song into the key a half-step up. If you want the same exact key, you can add or subtract 12, but that makes for some ugly key signatures.



      It's pretty intuitive; change the number of accidentals by seven, and you lower or raise every note by a half-step. That's the definition of how to transpose by a half-step!






      share|improve this answer























      • On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

        – supercat
        2 days ago






      • 1





        More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

        – Rosie F
        2 days ago













      5












      5








      5







      This is a consequence of the key signatures. Basically, what you're doing is changing the number of accidentals in the key signature by seven (some would argue that's an oxymoron, but you all know what I mean). It turns out that by doing this, you've transposed the song into the key a half-step up. If you want the same exact key, you can add or subtract 12, but that makes for some ugly key signatures.



      It's pretty intuitive; change the number of accidentals by seven, and you lower or raise every note by a half-step. That's the definition of how to transpose by a half-step!






      share|improve this answer













      This is a consequence of the key signatures. Basically, what you're doing is changing the number of accidentals in the key signature by seven (some would argue that's an oxymoron, but you all know what I mean). It turns out that by doing this, you've transposed the song into the key a half-step up. If you want the same exact key, you can add or subtract 12, but that makes for some ugly key signatures.



      It's pretty intuitive; change the number of accidentals by seven, and you lower or raise every note by a half-step. That's the definition of how to transpose by a half-step!







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered 2 days ago









      user45266user45266

      3,4201734




      3,4201734












      • On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

        – supercat
        2 days ago






      • 1





        More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

        – Rosie F
        2 days ago

















      • On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

        – supercat
        2 days ago






      • 1





        More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

        – Rosie F
        2 days ago
















      On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

      – supercat
      2 days ago





      On a related note, changing the number of accidentals by twelve will shift staff positions by a line or space while using the same set of pitches. For example, if one were to transpose a piano piece from five sharps (B major) to seven flats (Cb major), it would use all of the same pitches, but they'd all be written differently. Changing key by five in some direction is the same as changing key by twelve in that direction and seven in the opposite direction. So going from B to C would shift a staff position (going to Cb) and then moving a half step up without changing staff position.

      – supercat
      2 days ago




      1




      1





      More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

      – Rosie F
      2 days ago





      More to the point, you transpose by a chromatic semitone, leaving the letter part of each pitch name unchanged. (For example, from E to E flat, in the OP's example.)

      – Rosie F
      2 days ago











      5














      When you describe this kind of key relationship, I just "get it," because I know the key signatures well enough. But I really wanted to know why or how this relationship exists.



      Below is a chart I drew showing the circle of fifths (and circle of fourths) but arranged as a line. I'm not sure this will help you, but it shows the key 'symmetries' with keys paired up according to the funny modulus math @Richard describes in his answer.



      I like visuals and made the chart for myself last night. (I couldn't get to sleep after reading this post and had to make the chart just to clear my head!) Maybe it will be helpful or interesting to you...



      enter image description here



      The middle number row 0-11 is both the position on the circle of fifths/fourths and the number of sharps or flats in the key signature.



      When you go past the two dashed line boundaries - beyond the area I labelled the _7 letter gamut - you get into the weird enharmonically complex keys. You can get the modulus math to work in this region by adding a _negative number (bottom row) which represents going backwards on the circle of fifths. Ex. E#/F at position 11 and Fb/E at position -4, 11 + -4 = 7.



      When all 12 chromatic pitch classes are arranged by perfect fifths and numbered 0-11, the basic sequence for a major scale - starting on C - is 0,2,4,11,1,3,5. All the other keys signatures are transpositions of that numeric sequence on the circle. For example, just add 2 to each position to get D major (remember that 11 will circle back around to 0 the 1.)



      At the bottom of the chart is a sort of test that the numbering in the enharmonically complex area outside the gamut is true. As bizarre as it is to say 'Eb major is 9 sharps' is mathematically true.



      Finally, the is a kind of geometric symmetry of scale for each position along the circle. Any major key in the sharp keys shares mirror symmetry with the corresponding flat key's fifth mode of the relative minor. It's easier to explain by example: at position 3 A major A to A ascending shares a mirror symmetry with C minor (Eb's relative minor) G to G descending. You can test that on the keyboard as see how the two scales are inversions sharing the same sequence of whole and half steps and the same sequence of white and black keys.



      There isn't a specific musical term for all this, but when you write out the circle of fifths as a circle of counting line or compare the inversions of scales you have a kind of mathematical symmetry.






      share|improve this answer





























        5














        When you describe this kind of key relationship, I just "get it," because I know the key signatures well enough. But I really wanted to know why or how this relationship exists.



        Below is a chart I drew showing the circle of fifths (and circle of fourths) but arranged as a line. I'm not sure this will help you, but it shows the key 'symmetries' with keys paired up according to the funny modulus math @Richard describes in his answer.



        I like visuals and made the chart for myself last night. (I couldn't get to sleep after reading this post and had to make the chart just to clear my head!) Maybe it will be helpful or interesting to you...



        enter image description here



        The middle number row 0-11 is both the position on the circle of fifths/fourths and the number of sharps or flats in the key signature.



        When you go past the two dashed line boundaries - beyond the area I labelled the _7 letter gamut - you get into the weird enharmonically complex keys. You can get the modulus math to work in this region by adding a _negative number (bottom row) which represents going backwards on the circle of fifths. Ex. E#/F at position 11 and Fb/E at position -4, 11 + -4 = 7.



        When all 12 chromatic pitch classes are arranged by perfect fifths and numbered 0-11, the basic sequence for a major scale - starting on C - is 0,2,4,11,1,3,5. All the other keys signatures are transpositions of that numeric sequence on the circle. For example, just add 2 to each position to get D major (remember that 11 will circle back around to 0 the 1.)



        At the bottom of the chart is a sort of test that the numbering in the enharmonically complex area outside the gamut is true. As bizarre as it is to say 'Eb major is 9 sharps' is mathematically true.



        Finally, the is a kind of geometric symmetry of scale for each position along the circle. Any major key in the sharp keys shares mirror symmetry with the corresponding flat key's fifth mode of the relative minor. It's easier to explain by example: at position 3 A major A to A ascending shares a mirror symmetry with C minor (Eb's relative minor) G to G descending. You can test that on the keyboard as see how the two scales are inversions sharing the same sequence of whole and half steps and the same sequence of white and black keys.



        There isn't a specific musical term for all this, but when you write out the circle of fifths as a circle of counting line or compare the inversions of scales you have a kind of mathematical symmetry.






        share|improve this answer



























          5












          5








          5







          When you describe this kind of key relationship, I just "get it," because I know the key signatures well enough. But I really wanted to know why or how this relationship exists.



          Below is a chart I drew showing the circle of fifths (and circle of fourths) but arranged as a line. I'm not sure this will help you, but it shows the key 'symmetries' with keys paired up according to the funny modulus math @Richard describes in his answer.



          I like visuals and made the chart for myself last night. (I couldn't get to sleep after reading this post and had to make the chart just to clear my head!) Maybe it will be helpful or interesting to you...



          enter image description here



          The middle number row 0-11 is both the position on the circle of fifths/fourths and the number of sharps or flats in the key signature.



          When you go past the two dashed line boundaries - beyond the area I labelled the _7 letter gamut - you get into the weird enharmonically complex keys. You can get the modulus math to work in this region by adding a _negative number (bottom row) which represents going backwards on the circle of fifths. Ex. E#/F at position 11 and Fb/E at position -4, 11 + -4 = 7.



          When all 12 chromatic pitch classes are arranged by perfect fifths and numbered 0-11, the basic sequence for a major scale - starting on C - is 0,2,4,11,1,3,5. All the other keys signatures are transpositions of that numeric sequence on the circle. For example, just add 2 to each position to get D major (remember that 11 will circle back around to 0 the 1.)



          At the bottom of the chart is a sort of test that the numbering in the enharmonically complex area outside the gamut is true. As bizarre as it is to say 'Eb major is 9 sharps' is mathematically true.



          Finally, the is a kind of geometric symmetry of scale for each position along the circle. Any major key in the sharp keys shares mirror symmetry with the corresponding flat key's fifth mode of the relative minor. It's easier to explain by example: at position 3 A major A to A ascending shares a mirror symmetry with C minor (Eb's relative minor) G to G descending. You can test that on the keyboard as see how the two scales are inversions sharing the same sequence of whole and half steps and the same sequence of white and black keys.



          There isn't a specific musical term for all this, but when you write out the circle of fifths as a circle of counting line or compare the inversions of scales you have a kind of mathematical symmetry.






          share|improve this answer















          When you describe this kind of key relationship, I just "get it," because I know the key signatures well enough. But I really wanted to know why or how this relationship exists.



          Below is a chart I drew showing the circle of fifths (and circle of fourths) but arranged as a line. I'm not sure this will help you, but it shows the key 'symmetries' with keys paired up according to the funny modulus math @Richard describes in his answer.



          I like visuals and made the chart for myself last night. (I couldn't get to sleep after reading this post and had to make the chart just to clear my head!) Maybe it will be helpful or interesting to you...



          enter image description here



          The middle number row 0-11 is both the position on the circle of fifths/fourths and the number of sharps or flats in the key signature.



          When you go past the two dashed line boundaries - beyond the area I labelled the _7 letter gamut - you get into the weird enharmonically complex keys. You can get the modulus math to work in this region by adding a _negative number (bottom row) which represents going backwards on the circle of fifths. Ex. E#/F at position 11 and Fb/E at position -4, 11 + -4 = 7.



          When all 12 chromatic pitch classes are arranged by perfect fifths and numbered 0-11, the basic sequence for a major scale - starting on C - is 0,2,4,11,1,3,5. All the other keys signatures are transpositions of that numeric sequence on the circle. For example, just add 2 to each position to get D major (remember that 11 will circle back around to 0 the 1.)



          At the bottom of the chart is a sort of test that the numbering in the enharmonically complex area outside the gamut is true. As bizarre as it is to say 'Eb major is 9 sharps' is mathematically true.



          Finally, the is a kind of geometric symmetry of scale for each position along the circle. Any major key in the sharp keys shares mirror symmetry with the corresponding flat key's fifth mode of the relative minor. It's easier to explain by example: at position 3 A major A to A ascending shares a mirror symmetry with C minor (Eb's relative minor) G to G descending. You can test that on the keyboard as see how the two scales are inversions sharing the same sequence of whole and half steps and the same sequence of white and black keys.



          There isn't a specific musical term for all this, but when you write out the circle of fifths as a circle of counting line or compare the inversions of scales you have a kind of mathematical symmetry.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 2 days ago

























          answered 2 days ago









          Michael CurtisMichael Curtis

          9,411534




          9,411534





















              3















              I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?




              There isn’t a name for this phenomen. But we can find one. In German I would call them “gleichnamige” Tonarten, in English this would be “same named” keys.
              (Now, as we know they are not exactly the same name, as the “related” key*1) has added a -bemol (flat) and is a half tone lower!)



              The phenomen can be explained quite simply by the circle of fifths and by the tones of the twelve
              tone scale (fixed do names!)



              Do, Re-bemol, Re, Mi-bemol, Mi, Fa, Fa#/Sol-bemol, Sol, La-bemol, La, Si-bemol, Si.



              Of each tone of the doremi scale exist two keys: one on the -bemol site (flats) and the -diesis (sharps) site. The two keys with the same name are differing logically a minor second respectively 7 fifths
              and can be played by exchanging the amount of # with the amount of b of its same named (“related”) key:



              enter image description here



              So this “related” keys in question are:



              Si-bemol (2bemol) and Si (5#)



              analogically we get (starting with Re-bemol):



              Re-bemol and Re



              La-bemol and La



              Mi-bemol and Mi



              Si-bemol and Si



              Fa and Fa#



              Do and Do# (Re-bemol)



              Sol and Sol# (La-bemol)






              share|improve this answer



























                3















                I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?




                There isn’t a name for this phenomen. But we can find one. In German I would call them “gleichnamige” Tonarten, in English this would be “same named” keys.
                (Now, as we know they are not exactly the same name, as the “related” key*1) has added a -bemol (flat) and is a half tone lower!)



                The phenomen can be explained quite simply by the circle of fifths and by the tones of the twelve
                tone scale (fixed do names!)



                Do, Re-bemol, Re, Mi-bemol, Mi, Fa, Fa#/Sol-bemol, Sol, La-bemol, La, Si-bemol, Si.



                Of each tone of the doremi scale exist two keys: one on the -bemol site (flats) and the -diesis (sharps) site. The two keys with the same name are differing logically a minor second respectively 7 fifths
                and can be played by exchanging the amount of # with the amount of b of its same named (“related”) key:



                enter image description here



                So this “related” keys in question are:



                Si-bemol (2bemol) and Si (5#)



                analogically we get (starting with Re-bemol):



                Re-bemol and Re



                La-bemol and La



                Mi-bemol and Mi



                Si-bemol and Si



                Fa and Fa#



                Do and Do# (Re-bemol)



                Sol and Sol# (La-bemol)






                share|improve this answer

























                  3












                  3








                  3








                  I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?




                  There isn’t a name for this phenomen. But we can find one. In German I would call them “gleichnamige” Tonarten, in English this would be “same named” keys.
                  (Now, as we know they are not exactly the same name, as the “related” key*1) has added a -bemol (flat) and is a half tone lower!)



                  The phenomen can be explained quite simply by the circle of fifths and by the tones of the twelve
                  tone scale (fixed do names!)



                  Do, Re-bemol, Re, Mi-bemol, Mi, Fa, Fa#/Sol-bemol, Sol, La-bemol, La, Si-bemol, Si.



                  Of each tone of the doremi scale exist two keys: one on the -bemol site (flats) and the -diesis (sharps) site. The two keys with the same name are differing logically a minor second respectively 7 fifths
                  and can be played by exchanging the amount of # with the amount of b of its same named (“related”) key:



                  enter image description here



                  So this “related” keys in question are:



                  Si-bemol (2bemol) and Si (5#)



                  analogically we get (starting with Re-bemol):



                  Re-bemol and Re



                  La-bemol and La



                  Mi-bemol and Mi



                  Si-bemol and Si



                  Fa and Fa#



                  Do and Do# (Re-bemol)



                  Sol and Sol# (La-bemol)






                  share|improve this answer














                  I was curious if other combinations exists, let's say we have a song in 2 bemols (flats), what is the equivalence of it in diesis (sharps)? I couldn't find it myself. Is there a name for this phenomenon so I can learn more?




                  There isn’t a name for this phenomen. But we can find one. In German I would call them “gleichnamige” Tonarten, in English this would be “same named” keys.
                  (Now, as we know they are not exactly the same name, as the “related” key*1) has added a -bemol (flat) and is a half tone lower!)



                  The phenomen can be explained quite simply by the circle of fifths and by the tones of the twelve
                  tone scale (fixed do names!)



                  Do, Re-bemol, Re, Mi-bemol, Mi, Fa, Fa#/Sol-bemol, Sol, La-bemol, La, Si-bemol, Si.



                  Of each tone of the doremi scale exist two keys: one on the -bemol site (flats) and the -diesis (sharps) site. The two keys with the same name are differing logically a minor second respectively 7 fifths
                  and can be played by exchanging the amount of # with the amount of b of its same named (“related”) key:



                  enter image description here



                  So this “related” keys in question are:



                  Si-bemol (2bemol) and Si (5#)



                  analogically we get (starting with Re-bemol):



                  Re-bemol and Re



                  La-bemol and La



                  Mi-bemol and Mi



                  Si-bemol and Si



                  Fa and Fa#



                  Do and Do# (Re-bemol)



                  Sol and Sol# (La-bemol)







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Mar 10 at 23:46









                  Albrecht HügliAlbrecht Hügli

                  3,137220




                  3,137220




















                      Zacky is a new contributor. Be nice, and check out our Code of Conduct.









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