Here is a video from the Sigur Ros concert I went to in June. The concert was free and was intended to raise awareness for the environment, in particular the impact of aluminum smelting which is big industry here. The concert included Björk and Olfur Arnalds. The translated title of this song is "Within me a lunatic sings" and its from Sigur Ros's new album, if you haven't heard it yet I highly recommend checking it out.