Hoffman said tuning is not just a matter of having a good ear. Those strings have to stay put. It's a muscular thing more than an ear thing. It's like seasoning too much. It's easy to go too far.
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Changes in humidity change the pitch of a piano. Recording artist George Winston played the grand piano at Kaufman Auditorium and played it harder than anyone else Hoffman has ever tuned for. He takes a wide octave tuning. He likes almost pure fifths. He loved this piano.