A♯ (musical note)

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For other uses, see A♯.
A sharp

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 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 Octave name Frequency (Hz)
A♯−1 A♯͵͵͵ or ͵͵͵A♯ or AAAA♯ Subsubcontra 14.568
A♯0 A♯͵͵ or ͵͵A♯ or AAA♯ Subcontra 29.135
A♯1 A♯͵ or ͵A♯ or AA♯ Contra 58.27
A♯2 A♯ Great 116.541
A♯3 a♯ Small 233.082
A♯4 a♯′ One-lined 466.164
A♯5 a♯′′ Two-lined 932.328
A♯6 a♯′′′ Three-lined 1864.655
A♯7 a♯′′′′ Four-lined 3729.31
A♯8 a♯′′′′′ Five-lined 7458.62
A♯9 a♯′′′′′′ Six-lined 14917.24
A♯10 a♯′′′′′′′ Seven-lined 29834.481

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[]


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