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Hello all, Thanks for the clear explanation, Ed. What you are describing matches my theory of what is going on. For the record, this piano does have a back cover, and I was tuning it with the kneeboard ...

You mentioned that it is in a theatre. Perhaps the piano was on stage, with traditional incandescent stage lighting turned on? Though I think heating would have the opposite effect. Most pianos are ...

How were the unisons? If they were anything other than wildly out of tune, I'd say there's an oversight happening, and it was just tuned low. It having dropped uniformly makes this sound more likely. ...