A♭ (musical note)

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 A♭4) 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
A♭0 A♭͵͵ or ͵͵A♭ or AAA♭ (-vA♭) Subcontra 25.957
A♭1 A♭͵ or ͵A♭ or AA♭ (-wA♭) Contra 51.913
A♭2 A♭ (-xA♭) Great 103.826
A♭3 a♭ (-yA♭) Small 207.652
A♭4 a♭′ (zA♭) One-lined 415.305
A♭5 a♭′′ (yA♭) Two-lined 830.609
A♭6 a♭′′′ (xA♭) Three-lined 1661.219
A♭7 a♭′′′′ (wA♭) Four-lined 3322.438
A♭8 a♭′′′′′ (vA♭) Five-lined 6644.875
A♭9 a♭′′′′′′ (uA♭) Six-lined 13289.750
A♭10 a♭′′′′′′′ (tA♭) Seven-lined 26579.501

Scales

Common scales beginning on A♭

Diatonic scales

Jazz melodic minor

See also


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