A-flat (musical note)


A is the ninth semitone of the solfège.
It lies a diatonic semitone above G and a chromatic semitone below A, thus being enharmonic to G, even though in some musical tunings, A will have a different sounding pitch than G.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A above middle C is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.
The notes A and G are the only notes to have only one enharmonic, since they cannot be reached in any other way by a single or double sharp or a single or double flat from any of the seven white notes.

Scales

Common scales beginning on A

[Diatonic scale]s

Jazz melodic minor">Jazz scale">Jazz melodic minor