I found this on Robert Pattinson Online
and checked it out on iTunes. I have to say they are pretty good. There is a string quartet named Vitamin String Quartet who have covered seven of the songs on the Twilight soundtrack: Supermassive Black H***, Decode, I Caught Myself, Tremble For My Beloved, Leave Out All the Rest, Never Think and Let Me Sign. If you have iTunes you should check them out.