If you are a fan of Tom Waits, or of the fine television program The Wire, you will thank me for this.
First, go to the Kronos Quartet page.
Over at the left, click on the “Kronos Quartet plays Sigur Ros” graphic. This will popup a window with a Quicktime player in it. It will be playing Flugufrelsarinn by default. You can come back to that later if you want. For now, just click the item immediately below it for a lovely live version of Tom and the Quartet doing Way Down In The Hole.
Then you can go buy the CD:
Different version of that track are, of course, used as the intro music for the different seasons of The Wire.
You can read more about music in The Wire here: On The Corner
You can see another live version of the tune, from Big Time, on Youtube.