this band has become one of my favorites in the last year or two. They have a cello, upright bass, banjo and guitar. The singer is a girl and has a great voice. Here's a youtube link, the sound quality is not that great so go to itunes or their website and look for some better sounding stuff too. These guys are great and i'm sure you'll like them.
http://www.youtube.com/watch?v=zVTPWD8en70www.crookedstill.com
