Some my have heard of "Weird Al Yankovic" who does parodys of people's songs. James Blunt's record label didn't want his parody of "You're Beautiful" on his new album but it didn't stop him uploading it to his website.
See http://www.thelostplanet.net/WeirdAl/yourepitiful.mp3
See http://www.thelostplanet.net/WeirdAl/yourepitiful.mp3