Motorhead's cover of Judas Priest's Breaking the Law
Primal Scream's cover of Hawkwind's Motorhead (which was written by Lemmy Kilminster when he was with Hawkwind)
Hawkwind's Silver Machine by - well - just about any band when they first hung out to jam
Lots of stuff from Rainbow and Ritchie Blackmore's Rainbow (ignoring the crossovers with Deep Purple that persisted for a decade)
Stargazer covered by Dream Theater and a number of other bands Gates of Babylon covered by Yngwie Malmsteen I Surrender which was a cover by Rainbow of a song from Head East
Lots of crossover between The Nice and Emerson, Lake and Palmer, but
She Belongs to Me - the Nice do a cover of an early Bob Dylan classic
Fanfare for the Common Man and Hoedown - I call them 'covers' even though they were modern renditions of classical music, ELP paid Aaron Copland his due for performing them. And then covered by LOTS of bands.
From the Beginning was an original ELP fan favorite, covered later by Dokken
ELP did a cover of Peter Gunn too, but then, so did Art of Noise and a lot of other bands
Then Art of Noise covered Kiss which was a Prince original.
Peter Frampton's Baby I love your Way has been covered by many bands, including Will to Power
Do you feel like we do from Frampton was covered by Tesla
Ted Nugent's Cat Scratch Fever covered by Pantera
Black Sabbath's Planet Caravan by Pantera
Bowie's Heroes by Motorhead
Depeche Mode's Stripped covered by Rammstein
Sabaton's cover of Europe's The Final Countdown
War Pigs - Black Sabbath of course, but covered by Faith No More
Alice Cooper's No More Mr. Nice Guy covered by Megadeth
Did we do Paranoid yet?
Van Halen's Panama has been covered by lots of bands including Pat Boone of all people.
Then there's California Girls,I ain't got nobody, and Just a gigolo all on the same Van Halen album
VH's Jump has been covered so many times by so many bands it's wild.
Me and my Bro iN laW get into all the time about covers. Just because a hardcore band does a softcore cover doesn't make it badass. I love some bands that have done covers that I hate: Seether and Disturbed to name a couple (those always get us fighting), just different preferences IMHO, no biggie. The cover better add to the song to make me want to listen to it over the original. For example, and I may be rediculed, I will listen to Trivium's cover of Master of Puppets over the original anyday. There is bass that is audible and the production is amazing, the sound quality is nothing short of badass, and the vocals are just raw. Check it out.