The Indianapolis Symphony Orchestra offers some of the best live classical music in the world. As one of less than 10 full-time US symphonies, they offer a varied schedule all year long. Features include the Lilly Classical Series, and Marsh Symphony on the Prairie (an outdoor summer concert series).
The Hilbert Circle Theatre is a cozy, acoustically prime hall, beautifully decorated. Seats in the first mezzanine or lower are very good.