A♯ (musical note)

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. See pitch (music) for a discussion of historical variations in frequency.

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

 * A♯ Ionian: A♯ B♯ C D♯ E♯ F G A♯
 * A♯ Dorian: A♯ B♯ C♯ D♯ E♯ F G♯ A♯
 * A♯ Phrygian: A♯ B C♯ D♯ E♯ F♯ G♯ A♯
 * A♯ Lydian: A♯ B♯ C D E♯ F G A♯
 * A♯ Mixolydian: A♯ B♯ C D♯ E♯ F G♯ A♯
 * A♯ Aeolian: A♯ B♯ C♯ D♯ E♯ F♯ G♯ A♯
 * A♯ Locrian: A♯ B C♯ D♯ E F♯ G♯ A♯

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♯