eli5: in music, since there are 12 notes per octave, why are only 7 letters used instead of 12?

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eli5: in music, since there are 12 notes per octave, why are only 7 letters used instead of 12?

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There are only 7 different notes, so 7 letters : A B C D E F G. An octave goes from one note to the next same note : A B C D E F G A, so 8 notes and not 12.

I don’t know where that 12 comes from.

A scale only has 8 notes (7 distinct notes, because you count the root note twice.)

We named our notes off of the A major scale in the Aeolian mode, the notes of which are A B C D E F G (A)

Other scales include sharps or flats, but any given scale only has 7 different notes in it

Using a guitar sting as an example.

E, F, F#, G, G#, A, A#, B, C, C#, D, D#, E

I used sharps because I don’t know the symbol for flat on a keyboard.