Kutiman is an artist that takes YouTube videos and turns them into musical magic.
He starts by sampling the various clips that users have uploaded onto YouTube, such as a guitar lesson or a drum demo, and then combines them, along with the videos, into something else entirely. It’s a bit hard to explain, so I suggest that you just watch and see:
If you liked that, he’s created six more tracks that follow a similar structure, and all are available through YouTube on his site. (Which features a fantastic, destroyed-YouTube design, and is worth a look all on its own.)