A♯ (musical note)

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For other uses, see A♯.

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[edit]

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz)
A-1 A͵͵͵ or ͵͵͵A or AAAA (-uA) Subsubcontra 14.568
A0 A͵͵ or ͵͵A or AAA (-vA) Subcontra 29.135
A1 A͵ or ͵A or AA (-wA) Contra 58.270
A2 A (-xA) Great 116.541
A3 a (-yA) Small 233.082
A4 a (zA) One-lined 466.164
A5 a′′ (yA) Two-lined 932.328
A6 a′′′ (xA) Three-lined 1864.655
A7 a′′′′ (wA) Four-lined 3729.310
A8 a′′′′′ (vA) Five-lined 7458.620
A9 a′′′′′′ (uA) Six-lined 14917.240
A10 a′′′′′′′ (tA) Seven-lined 29834.481

Scales[edit]

Common scales beginning on A[edit]

  • 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[edit]

  • 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[edit]

See also[edit]