Dudley Moore’s recent stint with the National Symphony Orchestra suggests that it’s getting harder to lure patrons to classical performances. Such gimmickry, one hopes, will not be necessary when fiery Italian-born violinist Nadja Salerno-Sonnenberg joins the NSO for an eclectic program including Paul Hindemith’s “Symphonic Metamorphoses on Themes of Carl Maria von Weber,” Samuel Barber’s “Violin Concerto,” and Franz Schubert’s “Symphony No. 5.” (In the unlikely event of sluggish ticket sales, Woody Harrelson will join the ensemble on French horn.) At 8:30 p.m. tonight and tomorrow; at 7 p.m. Tuesday at the Kennedy Center Concert Hall. $11-45. (202) 467-4600. CP