Originally Posted by El Gordo
Well the OP clearly says "what band is covered for officially released albums the most often?" but carry on.
This also marks the third time (if I recall correctly) that I forget to re-read the post before replying to a thread.
I'm still sticking with Metallica (Mastodon, Bullet for My Valentine, Machine Head, Vader, Anthrax, Disturbed, Korn, Trivium, Sum 41, Primus, and if you want to go there, Nickelback, Avril Lavigne, and Snoop Dogg have all covered them), immediately followed by Pantera (not counting Damageplan or any other number of bands who play "Walk" randomly, because at least three are in here already - Disturbed, Avenged Sevenfold, Sylosis, Unearth, Zakk Wylde, 2Cents, Dream Theater, Butcher Babies, Evile, Chimera, Anal Cunt, Five Finger Donkey Punch, and Madonna, among others). I definitely agree with Iron Maiden and Slayer though.