Delightful NSO 'Rosenkavalier' features Fleming, Montsalvo and newcomer Houtzeel

This month, the National Symphony Orchestra is celebrating the 150th anniversary of Richard Strauss's birth with two programs almost entirely devoted not to symphonic music, but opera. The first was a one-off performance of the composer's most beloved opera, "Der Rosenkavalier," starring Renée Fleming, at the Kennedy Center Concert Hall on Saturday night.