(1):
(n.) Loosely, and now commonly, variety (see above), as, to play in vaudeville; a vaudeville actor.
(2):
(n.) A theatrical piece, usually a comedy, the dialogue of which is intermingled with light or satirical songs, set to familiar airs.
(3):
(n.) A kind of song of a lively character, frequently embodying a satire on some person or event, sung to a familiar air in couplets with a refrain; a street song; a topical song.