MTV : Music Matters
A music track written around footage of a drummer freestyling for the cameras, after the event. Not as easy as it sounds. The track had to be built so that video edits of his (completely out of time) drumming would sit in sync with the music, but the original film had been shot with no consistent beat, so matching edits were hard to find. Once the few usable clips had been picked, each drum had to be sampled or emulated to make a virtual kit with which to build a new drumtrack and music, then the video re-cut to fit the track.