Piano-playing sisters Katia and Marielle Labèque return to Severance Hall tonight at 7:30 to perform Bruch's romantic Concerto for Two Pianos, a piece influenced by Brahms. They'll also play Smetana's Má Vlast ("My Homeland"). Kent State University's Adam Roberts will deliver the pre-concert lecture "My Homeland: Reflections on European Identity." Performances also take place tomorrow and Sunday. Consult the Cleveland Orchestra website for more info. (Niesel)