Philadelphia Ballet presents a trio of works by George Balanchine at the city’s historic Academy of Music March 16-19. On the program are “Who Cares?” to music of Gershwin, “Agon” to Stravinsky, and “Ballet Imperial” to Tchaikovsky. Performances are Thursday and Friday, March 16 and 17 at 7:30 p.m.; Saturday, March 18 at 2 and 7:30 p.m.; and Sunday, March 19 at 2 p.m. Visit philadelphiaballet.org for tickets.