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The film opens with Bosko taking a bath while whistling "Singin' in the Bathtub". A series of gags allows him to play the shower spray like a harp, pull up his pants by tugging his hair, and give the limelight to the bathtub itself which stands on its hind feet to perform a dance.
Late at night, the mice come out and sing and play to the title tune, among others. That is, until the cat arrives, but he's quickly sent packing.
A streetcar conductor, Foxy has adventures with a would-be passenger hippo, a cow blocking the tracks, and a runaway train while Foxy, his passengers, and some hobos sing the title song.
A tribute to the Texas songster, Mance Lipscomb, considered by many to be the greatest guitarist of all time.