Dance Practice (IanTyf)

Instruction: 

Press and hold any alphanumeric key to be the pivot foot (dark blue). Press another key to move the free foot. When you lift a key (foot), the other one will become the new pivot foot. Try to hit the beats and get some practice in just so you won't have to sit in the corner at prom.

TL;DR: dance with two fingers on the keyboard.

Music: 

Brahms - 16 Waltzes, Op. 39: No. 15 in A-flat Major