I stumbled upon something that has made my day. It is called The String Quartet Tribute. If you visit their website you can see they have covered bands from Led Zeppelin to Radiohead, from Foo Fighters to Elliot Smith, from Snow Patrol to The Beach Boys and I have not even begun to scratch the surface they have around 280 albums to pick from. Here are a few of my favorite songs "strung out".
Weezer ~ Buddy Holly
Coldplay ~ Clocks
Muse ~ New Born
Muse ~ Time is Running Out
I love that whoever made the Muse videos put them to the music videos, I think it makes it better. You can also download the songs on itunes.