noun
a musical note that is one half step lower than A
adjective
describing the pitch of a musical note
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The pianist played a flawless a-flat in the concerto.
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I can never seem to hit the right note when playing an a-flat on the keyboard.
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Dude, that guitarist totally nailed the a-flat in that solo!
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Her mood was like an a-flat, somber and melancholic.