And surprised that WOTE's video that originally went viral's not on here with Goyte's Somebody that I used to Know:
I'd seen this before I saw the "original" and thought the original was the cover

Other than the JC cover of "Hurt" my favourite cover which sounds like the original is Holy Diver by Killswitch Engage (originally by Dio) -
But my favourite band for doing Cover's is Limp Bizkit. Even though I don't rate their own stuff they've got their distinct sound stamped all over each cover -