Sigur Rós reworked one of their famous tracks for Planet Earth II. 'Hoppipolla,' which appeared on their 2005 album Takk..., and was then used as the soundtrack for the original season of the David Attenborough-presented BBC series. And now that the second season is here years later, they've re-released it. Listen below.

"In Iceland we are blessed with a seemingly inexhaustible supply of wild and untamed places," syas Sigur Rós. "But even here, in the very furthest flung corners of Europe’s largest wilderness, the scars of human industry are visible, the plans for future encroachments, by dam and smelter, legion. If lost the Icelandic highlands are not recoverable. Around the world the story is the same; the traffic, literally, going in one direction. Sigur Rós are proud to be associated with Planet Earth II and its all-important mission to hold us rapt in understanding of, and respect for, this endlessly fascinating, utterly surprising and ultimately fragile place we are lucky enough to call home for a short while."