A♭ (A-flat; also called la bémol) is the first note of the A♭ major scale. A♭/G♯ is the only note to have only one other enharmonic.
| 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 |
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♭
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