So, this happened a couple weeks ago:
It was breathtaking and phenomenal.
Basically: if you haven't heard of Sigur Rós, you need to go listen to them right now. I suggest starting with Ágaetis byrjun, but really any one of their albums is a great listen. Fun fact, by the way: Sigur Rós produces some of my favorite writing music. Honestly, though, my favorite way to listen to them is in the dark, lights out, headphones turned up--the way beautiful, powerful music deserves to be consumed.