1. Noun.  (music) A tone four fifths below C in the cycle of fifths, intermediate between G and A, denoted A♭.
  2. Noun.  (music) A key or other mechanism for producing an A-flat.
  3. Noun.  (music) The key of A-flat major.

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This entry was last updated on RefTopia from its source on 3/20/2012.