In the meantime, here's something mind-blowing I spotted on Jonathan Coulton's site. An Israeli guy has taken a bunch of disparate YouTube clips (mostly music instruction ones) and chopped and edited them so that all the YouTube musicians are playing the same song--a song completely unlike the one in each individual clip.
The amount of work that goes into this staggers me. But oh! The payoff!
Check it out here.
Out of Context: "Being a thug means never having to say you're sorry."
Music: Radiohead, The Bends