sentences:  The theatre is the primary hall for the Eastman School's larger ensembles, including its orchestras, wind ensembles, jazz ensembles, and chorale.It originally contained 3,352 seats, but was substantially revised in 2009 to become a 2,260-seat concert hall with state-of-the-art acoustics optimized for symphonic, popular and chamber music performances.The theatre is the principal performance venue for the Rochester Philharmonic Orchestra, and the Eastman Opera Theatre presents fully staged operatic productions each spring.