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Olero
ANSWERS: 5
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88
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88
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A full keyboard is 88, and almost all acoustic pianos have that many. Electronic keyboards (the better ones) also have 88, unless they're focusing more on portability. Cheaper electronics tend to be shorter. 72 keys is common, as is 61. Below 61, you're going to have trouble playing many types of music without transposing or octave-shifting.
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One (to open the lid).......Oh, those keys...88 :o)
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On our piano it has 88
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