The 106 musicians of the New York Philharmonic haven’t performed together in concert since mid-March because of the coronavirus pandemic. But that hasn’t stopped trumpeter Ethan Bensdorf, a member of the orchestra since 2008, from finding a nightly audience.

Mr. Bensdorf has taken to standing on the roof of his 12-story apartment building in Manhattan’s Chelsea neighborhood and performing a brief work each evening, right after the 7 p.m. cheer for essential workers. He has played everything from Beatles tunes to “Taps,” not…

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