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Grand piano keyboard layout with 88 keys. 52 white and 36 black keys, 7 full octaves.
Lot - Mahogany Baby Grand Piano, 1908-1971, by Behr Bros & Co., New York, no visible serial number, 88 keys, with a mahogany music bench,...
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How many keys does a standard piano have? It's 88 – here's why... - Classic FM
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Musical Innovation: A Grander Grand Piano : NPR
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A Piano With a Curved Keyboard Will Star at Carnegie Hall - The New York Times
