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♯, 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 (or A♭₄) is approximately 415.305 Hz.^[1] 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.

[1]

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)	MIDI note number
A♭₋₁	A♭͵͵͵ or ͵͵͵A♭ or AAAA♭	Octocontra	12.978	8
A♭₀	A♭͵͵ or ͵͵A♭ or AAA♭	Subcontra	25.957	20
A♭₁	A♭͵ or ͵A♭ or AA♭	Contra	51.913	32
A♭₂	A♭	Great	103.826	44
A♭₃	a♭	Small	207.652	56
A♭₄	a♭′	One-lined	415.305	68
A♭₅	a♭′′	Two-lined	830.609	80
A♭₆	a♭′′′	Three-lined	1661.219	92
A♭₇	a♭′′′′	Four-lined	3322.438	104
A♭₈	a♭′′′′′	Five-lined	6644.875	116
A♭₉	a♭′′′′′′	Six-lined	13289.75	N/A
A♭₁₀	a♭′′′′′′′	Seven-lined	26579.501	N/A

A♭ (musical note)

Designation by octave

Scales

Common scales beginning on A♭

Diatonic scales

Jazz melodic minor

References

See also

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