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There are 7 octaves on a standard grand piano (plus a minor third, or one additional "black key"). If each octave has 5 accidentals (or black keys) then 7 octaves would have 35 black keys, plus the additional B Flat at the bottom of the piano.....so:

A 72 key piano has 36 black keys.

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12y ago
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Q: Hom many black keys would be on a 72 key piano?
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