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. 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.
Designation by octave
| Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) |
|---|---|---|---|
| A♭−1 | A♭͵͵͵ or ͵͵͵A♭ or AAAA♭ | Octocontra | 12.978 |
| A♭0 | A♭͵͵ or ͵͵A♭ or AAA♭ | Subcontra | 25.957 |
| A♭1 | A♭͵ or ͵A♭ or AA♭ | Contra | 51.913 |
| A♭2 | A♭ | Great | 103.826 |
| A♭3 | a♭ | Small | 207.652 |
| A♭4 | a♭′ | One-lined | 415.305 |
| A♭5 | a♭′′ | Two-lined | 830.609 |
| A♭6 | a♭′′′ | Three-lined | 1661.219 |
| A♭7 | a♭′′′′ | Four-lined | 3322.438 |
| A♭8 | a♭′′′′′ | Five-lined | 6644.875 |
| A♭9 | a♭′′′′′′ | Six-lined | 13289.75 |
| A♭10 | a♭′′′′′′′ | Seven-lined | 26579.501 |
Scales
Common scales beginning on A♭
- A♭ major: A♭ B♭ C D♭ E♭ F G A♭
- A♭ natural minor: A♭ B♭ C♭ D♭ E♭ F♭ G♭ A♭
- A♭ harmonic minor: A♭ B♭ C♭ D♭ E♭ F♭ G A♭
- A♭ melodic minor ascending: A♭ B♭ C♭ D♭ E♭ F G A♭
- A♭ melodic minor descending: A♭ G♭ F♭ E♭ D♭ C♭ B♭ A♭
Diatonic scales
Jazz melodic minor
- A♭ ascending melodic minor: A♭ B♭ C♭ D♭ E♭ F G A♭
- A♭ Dorian ♭2: A♭ B
C♭ D♭ E♭ F G♭ A♭ - A♭ Lydian augmented: A♭ B♭ C D E F G A♭
- A♭ Lydian dominant: A♭ B♭ C D E♭ F G♭ A♭
- A♭ Mixolydian ♭6: A♭ B♭ C D♭ E♭ F♭ G♭ A♭
- A♭ Locrian ♮2: A♭ B♭ C♭ D♭ E F♭ G♭ A♭
- A♭ altered: A♭ B C♭ D E F♭ G♭ A♭
See also
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