A mannequin in the city dump improvises a working piano from junk, then plays and sings the title song. Various discarded items join in with song or dance.
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.
A Chinese emperor is gladdened by the song of the nightingale and is moved to play his own song. One day the Japanese send a music box with a mechanical bird; the nightingale feels rejected and leaves. Soon the clockwork breaks down, and the emperor dispatches his crow to go look for the songbird....
Christmas Eve. A poor orphan boy trudges through the snow, pathetically. He finally arrives at his miserable cabin. While he is crying, Santa arrives and, singing the title song, offers to take the boy to his workshop. They arrive, and the toys go wild. He plays with a few toys. A candle falls off...
On Christmas morning two pups and the household's children are up early. The pups are frightened by a large stuffed dog, a train set, a crying doll, a toy tank, and other toys.
Little Cheeser is a young mouse who thinks he's more grown up than he is. Mama tells him to go to bed, calling him "Mama's little man"; he doesn't want to. His devil side emerges and guides him to the cheese in the pantry, where his angel side appears to stop him. The devil leads him on to the...
Bosko is a construction worker who impresses Honey by making music from everything in sight, including a decapitated mouse, a typewriter and a goat filled with hot air.
A streetcar conductor has adventures with a would-be passenger hippo, a cow blocking the tracks, and a runaway train while he, his passengers, and some hobos sing the title song.
Mrs. Mouse is reading "A Visit from St. Nicholas" to her brood when a cat tries to break in. The cat overhears them arguing about the existence of Santa, so he dresses up accordingly.