A♯ (musical note)
Musical note / From Wikipedia, the free encyclopedia
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For other uses, see A♯.
A♯ (A-sharp; also called la dièse) is the eleventh semitone of the solfège. In some countries (where B is known as H), it is also called B.
![{ \\new Staff \\with{ \\magnifyStaff #3/2 } << \\time 2/1 \\override Score.TimeSignature #'stencil = ##f { \\clef bass ais1_A-sharp \\clef treble ais' } >> }](http://upload.wikimedia.org/score/f/x/fx9z0t11bfkfrplrqyza34igjpmwuig/fx9z0t11.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/38/NotesASharp.png/320px-NotesASharp.png)
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 466.164Hz.[1] See pitch (music) for a discussion of historical variations in frequency.