This interests me as well. I once played in Broadway pit band with a pianist who was also a piano technician. He told me he tunes the piano to optimize the keys in which he will be playing predominantly. To illustrate, he got out his wrenches, tuned the piano like he would in your living room and played a song from the show. He then put it in a "sweetened" tuning as he called it, and played the same song. The first one sounded fine but I could hear the difference in the second. There's something to this.
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