I was surfing YouTube the other day, and I found a guy who played a bunch of song covers.
The lead singer is also the rhythm guitarist in the band called "Boyce Avenue", and he has one of the most amazing voices. His two older brothers are part of the band too. He plays the piano in two song covers. Of course, you should listen to his covers instead of listening to me, lol.

A couple of his covers:
Say - John Mayer coverhttp://www.youtube.com/watch?v=_V_DOMLVR7s&feature=userLovestoned - Justin Timberlake coverhttp://www.youtube.com/watch?v=T9wNAj2NToI&feature=relatedShadow of the Day - Linkin Park coverhttp://www.youtube.com/watch?v=WgG_4Akt9vM&feature=userAlicia Keys/Jordin Sparks/Fergie (Justin Timberlake) medley coverhttp://www.youtube.com/watch?v=6UIaJclKV3Y&feature=userApologize - OneRepublic coverhttp://www.youtube.com/watch?v=7DOasai3_Vo&feature=userBeautiful Girl & a bit of (Stand By Me) - Sean Kingston coverhttp://www.youtube.com/watch?v=sm2fTDpuyyM&feature=userWith You - Chris Brown coverhttp://www.youtube.com/watch?v=iTMvrpJ7IHM&feature=user...he has a few more covers, just click the youtube links on the right.
Oh yeah.. I stepped on some of their videos while searching for covers of Apologize with a friend.. They are really gud especially their vocals..