I give you the band String Theory.  It's a trio consisting of:  Cello, Violin, and Guitar. Here is a set list of songs they did in this video!

Full medley:
1999: Backstreet Boys, “I Want It That Way”
2000: blink-182, “What’s My Age Again?”
2001: Uncle Kracker, “Follow Me”
2002: Eminem, “Lose Yourself”
2003: OutKast, “Hey Ya!”
2004: Usher Feat. Lil’ Jon and Ludacris, “Yeah!”
2005: Kelly Clarkson, “Since U Been Gone”
2006: Gnarls Barkley, “Crazy”
2007: Plain White T’s, “Hey There Delilah”
2008: Jason Mraz, “I’m Yours”
2009: Coldplay, “Viva La Vida”
2010: Taylor Swift, “You Belong With Me”
2011: Adele, “Rolling in the Deep”
2012: fun., “We Are Young”

This is incredible, like these guys on facebook!!  http://www.facebook.com/pages/String-Theory-Band/332296656824122?ref=ts