Hell's Bells

Although the "Skeleton Dance" is considered by many to be one of (if not 'the') main highlight of Ub Iwerks' animation career, "Hell's Bells", to me, is just as equally amazing, animation-wise & music-wise.
This cartoon was released in November 1929, only about three months after "The Skeleton Dance". This cartoon never fails to entertain & inspire me. The highlight to me is the dance cycle of the three devils around 2:40, it always makes my jaw drop.