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So you missed out on those superquartet Ax, Stern, Laredo, and Ma tickets. For those not quick enough on the draw, there’s still an option to hear some great music played by the pros elsewhere inside the Kennedy Center. Since his appointment as conductor of the National Symphony Orchestra in 1996, Leonard Slatkin has used his considerable skills as a conductor to fine-tune the orchestra’s abilities as an ensemble. However, his first musical studies were on the piano, and tonight Slatkin joins Joseph Kalichstein for a performance of Ravel’s piano duet, Ma Mere l’Oye. Also appearing are NSO principals William Steck, David Hardy, and Daniel Foster, performing works by Bruch, Martinu, and Grieg. At 7:30 p.m. at the Kennedy Center Terrace Theater. $25. (202) 467-4600. (Amy Domingues)