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A♯ (A-sharp; French: la dièse) is the eleventh semitone of the solfège.
This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to B♭ (French: si bémol).
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A♯ above middle C is approximately 466.164Hz.[1] See pitch (music) for a discussion of historical variations in frequency.
| Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) | MIDI note number |
|---|---|---|---|---|
| A♯−1 | A♯͵͵͵ or ͵͵͵A♯ or AAAA♯ | Subsubcontra | 14.568 | 10 |
| A♯0 | A♯͵͵ or ͵͵A♯ or AAA♯ | Subcontra | 29.135 | 22 |
| A♯1 | A♯͵ or ͵A♯ or AA♯ | Contra | 58.27 | 34 |
| A♯2 | A♯ | Great | 116.541 | 46 |
| A♯3 | a♯ | Small | 233.082 | 58 |
| A♯4 | a♯′ | One-lined | 466.164 | 70 |
| A♯5 | a♯′′ | Two-lined | 932.328 | 82 |
| A♯6 | a♯′′′ | Three-lined | 1864.655 | 94 |
| A♯7 | a♯′′′′ | Four-lined | 3729.31 | 106 |
| A♯8 | a♯′′′′′ | Five-lined | 7458.62 | 118 |
| A♯9 | a♯′′′′′′ | Six-lined | 14917.24 | N/A |
| A♯10 | a♯′′′′′′′ | Seven-lined | 29834.481 | N/A |
D♯ E♯ F G A♯ A♯ G A♯ D♯ E♯ F G A♯ G♯ A♯ D E♯ F G A♯ D♯ E♯ F G♯ A♯ G A♯ G♯ A♯ D E F G A♯ D E♯ F G♯ A♯ D♯ E♯ F♯ G♯ A♯
