A-sharp, A or A# may refer to:
* A-sharp major, enharmonic to
B-flat major
B-flat major is a major scale based on B, with pitches B, C, D, E, F, G, and A. Its key signature has two flats. Its relative minor is G minor and its parallel minor is B-flat minor.
The B-flat major scale is:
:
Many transposing instr ...
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A-sharp minor
A-sharp minor is a minor musical scale based on A, consisting of the pitches A, B, C, D, E, F, and G. Its key signature has seven sharps, while the direct enharmonic equivalent, B-flat minor, has five flats.
Its relative major is C-sh ...
*
A♯ (musical note)
A (A-sharp; also called la dièse) is the eleventh semitone of the solfege. In some countries (where B is known as H) it is informally called B.
This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmo ...
, musical pitch
*
A Sharp (.NET)
A# is a port of the Ada programming language to the Microsoft .NET platform. A# is freely distributed by the Department of Computer Science at the United States Air Force Academy as a service to the Ada community under the terms of the GNU Ge ...
, a port of the Ada programming language to the .NET environment
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A Sharp (Axiom), a programming language for the Axiom computer algebra system
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