This has to be one of the best covers I've ever heard... It's an opera singer covering Dave Matthews' song "#41" (singing and playing piano) while rehearsing for a recording, and they caught it on tape. Dave Matthews fans and fans of beautiful music altogether will absolutely love this... thank me later guys...
http://www.youtube.com/watch?v=vlfPkYJppoM
You don't see too many opera singers covering non-opera songs... what's everyone think?