http://www.youtube.com/watch?v=wQVEPFzkhaM Harder, Better, Faster, Stronger by Daft Punk done a capella.
http://www.youtube.com/watch?v=U8BWBn26bX0 The music video to Frontier Psychiatrist by The Avalanches.
http://www.youtube.com/watch?v=jpFFzWPzA2c How about some Katamari love?