Tonight at 7:30 at Severance Hall, the Cleveland Orchestra takes on Stravinsky's ballet score Petrushka. Set at a winter's town fair, the piece centers on a puppet who tries to find true love. Tonight's concert will also feature Eötvös' Seven, composed as a memorial for the astronauts who died in NASA's Space Shuttle Columbia disaster, which happened Feb. 1, 2003. Eric Charnofsky, a music instructor at Case Western Reserve University, gives the pre-concert talk at 6:30 p.m. There's a repeat performance at 8 p.m. on Saturday. Ticket prices are on the website. (Niesel)