A percussionist uses food cans to simulate the sounds in a kitchen where cheesesteaks are being made during a rehearsal of "Philadelphia Voices," at the Kimmel Center in Philadelphia, April 4, 2018. The Philadelphia Orchestra and conductor Yannick Nézet-Séguin will perform Tod Machover's symphony about the city at Carnegie Hall on Tuesday, April 10, 2018. (Jessica Kourkounis/The New York Times)