WordNet (r) 3.0 (2006):

musical comedy
    n 1: a play or film whose action and dialogue is interspersed
         with singing and dancing [syn: musical, musical comedy,
         musical theater]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "musical comedy":
   Broadway musical, Singspiel, Thalia, arlequinade, ballad opera,
   ballet, ballet divertissement, black comedy, broad comedy,
   burlesque, burletta, camp, chorus show, comedie bouffe,
   comedie larmoyante, comedie rosse, comedietta, comedy,
   comedy ballet, comedy of humors, comedy of ideas,
   comedy of intrigue, comedy of manners, comedy of situation,
   comedy relief, comic muse, comic opera, comic relief, dance drama,
   dark comedy, domestic comedy, exode, farce, farce comedy,
   genteel comedy, grand opera, harlequinade, high camp, light comedy,
   light opera, low camp, low comedy, lyric drama, mime, minstrel,
   minstrel show, music drama, musical, musical stage,
   musical theater, opera, opera ballet, opera bouffe, opera buffa,
   operetta, raw comedy, realistic comedy, romantic comedy,
   satyr play, sentimental comedy, situation comedy, slapstick,
   slapstick comedy, song-and-dance act, song-play, tragicomedy