Last night, Sigur Rós performed in their native Iceland for the first time in four years and to commemorate the occasion they played a new song called "Brennisteinn." Musically, it's a bit of a departure from what they usually do, featuring big bursts of electronic noise. Watch it below. [videoembed size="full_width" alignment="center"][/videoembed] (via CoS) Valtari is out now on XL. ...