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It’s natural that stellar classical musicians are drawn to one another for collaboration; when virtuosity and sensitivity are common currency, the focus can be solely on playing the shit out of a chosen repertoire. The mutual admiration of pianist Emanuel Ax and cellist Yo-Yo Ma goes back nearly five decades, but while performing together at Tanglewood, the Boston Symphony Orchestra’s home in western Massachusetts a few years ago, they invited a slightly junior colleague to join them.…