Ziggy Stardust originally by David Bowie, covered by Bauhaus.

I smurfing love David Bowie, but Peter Murphy shows him up on this one. This cover is better than the original.

Free Fallin' by Tom Petty, covered by Stevie Nicks.

Stevie is <3 to begin with, but I nearly drool when I hear her cover of this song, it's so full of awesome.