A♭ (musical note)

For other uses, see A-flat.

A (A-flat; also called la bémol) 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, although 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 (or A4) is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.

A/G is the only note to have only one other enharmonic.

Designation by octave

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz)
A-1 A͵͵͵ or ͵͵͵A or AAAA (-uA) Subsubcontra 12.978
A0 A͵͵ or ͵͵A or AAA (-vA) Subcontra 25.957
A1 A͵ or ͵A or AA (-wA) Contra 51.913
A2 A (-xA) Great 103.826
A3 a (-yA) Small 207.652
A4 a (zA) One-lined 415.305
A5 a (yA) Two-lined 830.609
A6 a (xA) Three-lined 1661.219
A7 a (wA) Four-lined 3322.438
A8 a (vA) Five-lined 6644.875
A9 a (uA) Six-lined 13289.750
A10 a (tA) Seven-lined 26579.501


Common scales beginning on A

Diatonic scales

Jazz Melodic Minor

See also

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