[MuseSick]

I think one of the best cover bands I've ever herd would have to be Boyce Avenue.
Personally- my favorite is their cover of Every Teardrop Is a Waterfall, which is originally by Cold Play. Boyce Avenue just makes it ten times better.

That- and Ben Lee's Cover of Float on, which is originally sang by Modest Mouse, they take the upbeat song, which is lovely I admit, I adore the modest Mouse version, but some day's when you feel like quiet music, it's really superb!

Also- I've herd so many cover's of Cheap Trick's I want You To Want me, but I think the one by Letter's to Cleo is my favorite. It was played in the movie Ten Things I Hate About you. Now of course I love Cheap Trick, but at the time, I honestly couldn't find a good, solid version of it sung by Cheap Trick, so when I found the Letters to Cleo cover, I was stoked. :D

All great songs, both original's, AND covers.