A♯ (musical note)

A (A-sharp), or la dièse, is the eleventh semitone of the solfege. In some countries (where B is known as H) it is informally called B.

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. 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 AAAASubsubcontra14.568
A0A͵͵ or ͵͵A or AAASubcontra29.135
A1A͵ or ͵A or AAContra58.27
A2AGreat116.541
A3aSmall233.082
A4aOne-lined466.164
A5aTwo-lined932.328
A6aThree-lined1864.655
A7aFour-lined3729.31
A8aFive-lined7458.62
A9aSix-lined14917.24
A10aSeven-lined29834.481

Scales

Common scales beginning on A

  • A Major: A B C D E F G A
  • A Natural Minor: A B C D E F G A
  • A Harmonic Minor: A B C D E F G A
  • A Melodic Minor Ascending: A B C D E F G A
  • A Melodic Minor Descending: A G F E D C B A

Diatonic scales

  • A Ionian: A B C D E F G A
  • A Dorian: A B C D E F G A
  • A Phrygian: A B C D E F G A
  • A Lydian: A B C D E F G A
  • A Mixolydian: A B C D E F 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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