I don't think some of these covers are better than the original. Johnny Cash's version of Hurt is not better than the NIN, it's great because he made the song his own.

Like Nirvana's unplugged take of Leadbelly's - My Girl. Kurt Cobain made that song his own with a great performance. Mark Lanigan used to do an even better version.

Always liked Oasis doing - I am the Walrus

Good thread.