Well I think Opeth's cover of Deep Purple's Soldier of Fortune was better than original. Machine Head's cover of Iron Maiden's Hallowed be thy Name is way better imo and Ministry did a killer version of Roadhouse Blues by Jeff Healey, I think Healey did it

http://www.youtube.com/watch?v=NLmlJT-kc1g


http://www.youtube.com/watch?v=7vYixpbff9Y