This guy is AMAZING! He is on the show French Idol. His name is Joseph Pulpo. The songs he does are as I know:
Wacko Jacko - Billy Jean
Usher - Yeah
Anita Ward - Ring My Bell (best one he does IMO)
Yoshimoto - Du What U Du
Four Elements - Wind Element - Kenny Muhammad
UPDATE: Clearly Joseph here is not as unknown as he once was. I realize he is not as unknown anymore. That means there is no need to post a comment telling me that. Also, Wacko Jacko stays just to piss off whoever is offended by it.