Order of sharps: FCGDAEB
Order of flats (order of sharps in reverse): BEADGCF
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Keys close to each other sound harmonious, chords far apart may seem more foreign.
similar to color theory, there are triads used in music theory. art https://www.youtube.com/watch?v=62tIvfP9A2w
c d e f g a b g a b c d e f# d e f# g a b c# a b c# d e f# g# e f# g# a b c# d# b c# d# e f# g# a# f# g# a# b c# d# e# c# d# e# f# g# a# b# (notationally d_ (d flat))
f g a b_ c d e b_ c d e_ f g a e_ f g a_ b_ c d a_ b_ c d_ e_ f g d_ e_ f g_ a_ b_ c g_ a_ b_ c_ d_ e_ f c_ d_ e_ f_ g_ a_ b_
0 := c 11 := b
c, c#, d, d#, e, f, f#, g, g#, a, a#, b 0, 1 , 2, 3 , 4, 5, 6 , 7, 8 , 9, 10, 11
0 2 4 5 7 9 11 7 9 11 0 2 4 6 2 4 6 7 9 11 1 9 11 1 2 4 6 8 4 6 8 9 11 1 3 11 1 3 4 6 8 10 6 8 10 11 1 3 5 1 3 5 6 8 10 0
5 7 9 10 0 2 4 10 0 2 3 5 7 9 3 5 7 8 10 0 2 8 10 0 1 3 5 7 1 3 5 6 8 10 0 6 8 10 11 1 3 5 11 1 3 4 6 8 10
9 11 0 2 4 5 7 4 6 7 9 11 0 2 11 1 2 4 6 7 9 6 8 9 11 1 2 4 1 3 4 6 8 9 11 8 10 11 1 3 4 6 3 5 6 8 10 11 1 10 0 1 3 5 6 8
2 4 5 7 9 10 0 7 9 10 0 2 3 5 0 2 3 5 7 8 10 5 7 8 10 0 1 3 10 0 1 3 5 6 8 3 5 6 8 10 11 1 8 10 11 1 3 4 6
C major c d e f g a b g major g a b c d e f# d major d e f# g a b c# a major a b c# d e f# g# e major e f# g# a b c# d# b major b c# d# e f# g# a# f# major f# g# a# b c# d# e# c# major c# d# e# f# g# a# b# (notationally d_ (d flat)) f major f g a b_ c d e b major b_ c d e_ f g a e flat major e_ f g a_ b_ c d a flat major a_ b_ c d_ e_ f g d flat major d_ e_ f g_ a_ b_ c g flat major g_ a_ b_ c_ d_ e_ f c flat major c_ d_ e_ f_ g_ a_ b_
music_theory: