Although it's only 6:18 in length, this is one of my favorite movies. The artwork, the story, the rhythm and of course... the music: all is perfect in this wonderful cartoon.
The music is adapted by french composer Serge Besset, from La Follia composed by Corelli.
Here you can find the "original version" by Corelli: download
and here is a variation on the same theme by Rachmaninov: download