Well, I admittedly didn't see the post rules, just seen 'Covers'. And there's no better cover, IMHO, than FFDP's remake of Offspring's 'Gone Away'.
I don't remember what I thought, but I'm pretty sure it had to do with the blankets on a bed rather than the music from a band. Lol. I'm so lame.
Here is Phish covering Ween's "Roses Are Free". EDIT: If you're totally unfamiliar with Ween but are still a bit curious... Here is a link to the original! Woops... It won't post as a link. Well here's that vid too!
This is the Ramones absolute garbage song “The KKK Took My Baby Away”: And this is MXPX completely bombing the shitty Ramones out of the water: