I'm not going to touch anything that's been (Good or Bad) previously listed.
Good:
Robert Plant - Your Ma Said You Cried In Your Sleep Last Night
Rod Stewart - Downtown Train
Urge Overkill - Girl, You'll Be A Woman Soon
Not Good:
Guns N' Roses - Sympathy For The Devil
IMO, Axel and company did a nice job with covers of, among others, "Knockin' On Heaven's Door" and "Live And Let Die" , but not this one.
Spiderbait - Black Betty
This dreadful version of the Ram Jam classic sounds like a cross between a garage band and Flatt & Scruggs.
Will To Power - I'm Not In Love
Nothing like Lite FM ready covers of Pop/Rock crossover classics, and just when I thought that this band couldn't do any worse than "Baby, I Love Your Way / Freebird Medley (Free Baby)", somehow, how they managed to do just that.
Yuck!