Ferrante and Teicher, the slickest double play combination this side of the baseball strike, performed last night at Wolf Trap before a rapt audience.

Even now, 27 years after the two Juilliard graduates first teamed up, it's hard to tell them apart. "The grand twins of twin grands," as they were introduced, walked on wearing burgundy dinner jackets, each sporting glasses, a mustache, and thick, black hair. Later, in matching violet and silver lame tuxes, they looked like a double cross between Liberace and Groucho Marx.

Even harder to discern at times was who was doing what at the keyboards. On some of the more substantial pieces, the Broadway showtunes, for example, their exchanges were so swift and deft that one had the feeling of watching a couple of tennis pros at work.

Unfortunately, the program included only one selection not arranged by the pianists: Ravel's "Bolero," based on the composer's transcription for two pianos, offered a thoroughly enjoyable interlude, though a surprisingly short one given the length of the original score.

Much of what remained, apart from a rather amusing spoof on their physical similarities based on "Tea for Two," could be best described as crowd pleasers -- either frothy or overly dramatic readings of pop standards that passed pleasantly and forgettably into the night.