Kronos Quartet is a string quartet that specialises in “new music”. A few years ago they did a rearrangement of Sigur Ros’ Flugufrelsarinn, from their second (and apparently much acclaimed) album agaetis byrjun, as an encore piece for their concerts. They have now released it as a single titled Kronos Quartet plays Sigur Ros.
I have a copy of agaetis byrjun and I really liked most of it. (I must admit I have unusual musical taste.) Flugufrelsarinn was one of my favorite songs from that album, and Kronos Quartet’s rearrangement was excellent. There are more details on the rearrangement from the Kronos Quartet web site.
It’s really nice. You should try it. Available from iTunes