A♯ (musical note)

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.

For other uses, see A♯.
{ \new Staff \with{ \magnifyStaff #3/2 } << \time 2/1 \override Score.TimeSignature #'stencil = ##f { \clef bass ais1_A-sharp \clef treble ais'_A-sharp } >> }

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

Designation by octave
Scientific designation Helmholtz designation Octave name Frequency (Hz)
A♯−1A♯͵͵͵ or ͵͵͵A♯ or AAAA♯Subsubcontra14.568
A♯0A♯͵͵ or ͵͵A♯ or AAA♯Subcontra29.135
A♯1A♯͵ or ͵A♯ or AA♯Contra58.27
A♯2A♯Great116.541
A♯3a♯Small233.082
A♯4a♯′One-lined466.164
A♯5a♯′′Two-lined932.328
A♯6a♯′′′Three-lined1864.655
A♯7a♯′′′′Four-lined3729.31
A♯8a♯′′′′′Five-lined7458.62
A♯9a♯′′′′′′Six-lined14917.24
A♯10a♯′′′′′′′Seven-lined29834.481

Scales

Common scales beginning on A♯
  • A♯ major: A♯ B♯ Cdouble sharp D♯ E♯ Fdouble sharp Gdouble sharp A♯
  • A♯ natural minor: A♯ B♯ C♯ D♯ E♯ F♯ G♯ A♯
  • A♯ harmonic minor: A♯ B♯ C♯ D♯ E♯ F♯ Gdouble sharp A♯
  • A♯ melodic minor ascending: A♯ B♯ C♯ D♯ E♯ Fdouble sharp Gdouble sharp A♯
  • A♯ melodic minor descending: A♯ G♯ F♯ E♯ D♯ C♯ B♯ A♯

Diatonic scales
  • A♯ Ionian: A♯ B♯ Cdouble sharp D♯ E♯ Fdouble sharp Gdouble sharp A♯
  • A♯ Dorian: A♯ B♯ C♯ D♯ E♯ Fdouble sharp G♯ A♯
  • A♯ Phrygian: A♯ B C♯ D♯ E♯ F♯ G♯ A♯
  • A♯ Lydian: A♯ B♯ Cdouble sharp Ddouble sharp E♯ Fdouble sharp Gdouble sharp A♯
  • A♯ Mixolydian: A♯ B♯ Cdouble sharp D♯ E♯ Fdouble sharp 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

See also

References
  1. "Frequencies for equal-tempered scale". pages.mtu.edu. Retrieved 2022-10-30.


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