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A♭ (musical note)

From Wikipedia, the free encyclopedia

A (A-flat; also called la bémol) is the ninth semitone of the solfège.

It lies a diatonic semitone above G and a chromatic semitone below A, thus being enharmonic to G, even though in some musical tunings, A will have a different sounding pitch than G.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A above middle C (or A4) is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.

A/G is the only note to have only one other enharmonic.

Designation by octave

Scientific designation Helmholtz designation Octave name Frequency (Hz)
A−1 A͵͵͵ or ͵͵͵A or AAAA Octocontra 12.978
A0 A͵͵ or ͵͵A or AAA Subcontra 25.957
A1 A͵ or ͵A or AA Contra 51.913
A2 A Great 103.826
A3 a Small 207.652
A4 a One-lined 415.305
A5 a′′ Two-lined 830.609
A6 a′′′ Three-lined 1661.219
A7 a′′′′ Four-lined 3322.438
A8 a′′′′′ Five-lined 6644.875
A9 a′′′′′′ Six-lined 13289.75
A10 a′′′′′′′ Seven-lined 26579.501

Scales

Common scales beginning on 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
    double flat
    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
    double flat
    C D E
    double flat
    F G A

Jazz melodic minor

See also


This page was last edited on 3 March 2021, at 04:31
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