Tchaikovsky wrote his Fourth Symphony as he battled personal demons; the act of writing the piece reportedly helped him achieve some semblance of sanity. Tonight at 8 at Blossom Music Center, the Cleveland Orchestra performs the symphony; demons are optional. The program also includes Mussorgsky's "Dawn on the Moskva River" and Prokofiev's Piano Concerto No. 3. Consult the orchestra website for ticket prices. (Niesel)