[deethythitoth]

Agreed with Nabbe. Guns N' Roses version of Knocking on Heaven's door is horrible

Others include...

Best:

Nirvana - The Man Who Sold The World
Metallica - Turn The Page
Metallica - So What
Disturbed - Fade To Black

Worst:

Snoop Dog - Sad But True *cringes*
Avril Lavigne - Fuel

those are the ones off the top of my head