I keep the Kronos Quartet version of Flugufrelsarinn on rotation on my ipod. You can find it on itunes if you're interested. When I'm stressed, I put that on and it soothes away the troubles even for a few minutes. I found a performance video on youtube of the song, so that you can experience how awesome it is. Oh, forget the images on the screen. The images of flying birds added by the person who posted it gets distracting from the performance footage. Just turn up the volume on the speakers, close your eyes and listen. Feel the music and it's emotions. It's truly a beautiful rendition.
Flugufrelsarinn by Sigur Ros. Performed by Kronos Quartet.