The InterSchool Orchestras of New York is a youth orchestra program consisting of several orchestras and a symphonic band. Peter Jay Sharp Theatre at Symphony Space presents a program of the organization’s four entry-level ensembles — ISO at Turtle Bay, Trinity Florentine, Morningside, and Queens East Orchestras — as well as its intermediate level ensemble, Carnegie Hill. 2537 Broadway at 95th St. May 15, 4 p.m. Tickets are $20, $10 for children at symphonyspace.org.