Music for Yogis

I've noticed recently that several of my teachers are using the Icelandic alternative band Sigur Ros as a soundtrack in class. It's happened with three different teachers who don't know each other, so I think that qualifies as a genuine phenomenon. I like me some dreamy, Arctic pop music, so I'm all for it, though I generally prefer to have no music when I'm teaching and practicing. Read my (just updated!) answers to embarrassing yoga questions for what to do when you can't get down with your teacher as DJ.