Our first dance song was Thank You by Led Zeppelin, except we had one of our groomsmen who is an amazing musician doing it acoustically in the style of the Chris Cornell cover. This is the Chris Cornell version (And I would like to add that
finding this youtube clip resulted in me bawling my eyes out remembering Alex's version, hahahaha!)
http://www.youtube.com/watch?v=FRM9uuEcPGE
You should check out Boyce Avenue - they do acoustic covers of popular songs! They are absolutely amazing, this is a link to them doing Without You by David Guetta ft. Usher
http://www.youtube.com/watch?v=Z3C83KdIljo&feature=relmfu
I'm gonna keep thinking cuz I know I can come up with more! :P