Walt Disney started the Silly Symphonies animated short series as a way to complement his new, but already very popular Mickey Mouse cartoons. The first in the series — The Skeleton Dance — was released in 1929 just one year after Steamboat Willie.
The series of animated shorts was inspired by composer Carl Stalling. He wanted to do a series based on different musical themes each with a different cast of characters. The music for The Skeleton Dance was inspired by a Fox Trot, but set in a minor key.
In the short four skeletons have a merry dance macabre in a church cemetery: