A♯ (musical note)

A♯ (A-sharp), or La Dièse, is the eleventh semitone of the solfege.

This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to Si Bémol or B♭ (B-flat).

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

Designation by octave

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz)
A♯−1 A♯͵͵͵ or ͵͵͵A♯ or AAAA♯ (-uA♯) Subsubcontra 14.568
A♯0 A♯͵͵ or ͵͵A♯ or AAA♯ (-vA♯) Subcontra 29.135
A♯1 A♯͵ or ͵A♯ or AA♯ (-wA♯) Contra 58.270
A♯2 A♯ (-xA♯) Great 116.541
A♯3 a♯ (-yA♯) Small 233.082
A♯4 a♯′ (zA♯) One-lined 466.164
A♯5 a♯′′ (yA♯) Two-lined 932.328
A♯6 a♯′′′ (xA♯) Three-lined 1864.655
A♯7 a♯′′′′ (wA♯) Four-lined 3729.310
A♯8 a♯′′′′′ (vA♯) Five-lined 7458.620
A♯9 a♯′′′′′′ (uA♯) Six-lined 14917.240
A♯10 a♯′′′′′′′ (tA♯) Seven-lined 29834.481

Scales

Common scales beginning on A♯

Diatonic scales

Jazz melodic minor

See also


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