How about "This Flight Tonight" from Nazzareth, written by Joni Mitchell? :D

Or "Woodstock" from Crosby, Stills & Nash, also written by Joni Mitchell? :cool:

Or "Lady Marmalade" from the Moulin Rouge soundtrack, originally by Patti Labelle? :)

Going the other way, how about covers that suck so bad, the original leaves it in the dust? Like...

"American Woman" trashed by Lenny Kravitz, originally by The Guess Who? :(

Or one that makes me grind my teeth: "Rock On" desecrated by some recent travesty that shall evermore remain nameless, blown away by the original David Essex. :mad: