Fantasia
Fantasia (1940) is an animated film, directed and produced by Walt Disney, which mixes animation with classical music.
References
In Itchy and Scratchy Land the "Scratchtasia" segment spoofs the "Sorcerer's Apprentice" segment.
When Homer claims to be smarter than Flanders the Devil in Treehouse of Horror IV Ned Flanders transforms into Tchernobog the Devil from the "Night at Bald Mountain" segment from "Fantasia."
In the episode Simpsons Bible Stories Nelson Muntz angry appearance from the rubble of his tower mimicks the scene where Tchernobog the Devil throws his hands in the air in the "Night at Bald Mountain" segment. The background music even quotes the same music.
The couch gag used for the episode Homerazzi where Homer's evolution is shown parodies several scenes from the Rite of Spring segment from "Fantasia", from the creation of the first organisms until the extinction of the dinosaurs.