Sigur Rós have shared their first new single in seven years, an orchestral piece called 'Blóðberg'.

The song is the first in a decade to feature multi-instrumentalist Kjartan Sveinsson, who has rejoined the band after leaving in 2012, with frontman Jónsi and bassist Georg Holm also appearing on the piece together with the London Contemporary Orchestra. You can watch a video for the track, made by Chernobyl series director Johan Renck, above.

Speaking about the video, Renck said in a statement: "I feel as nihilistic as one could regarding the future. We are powerless against our own stupidities. Some aspects of this came to merge with my impressions of the themes of 'Blóðberg'. The music becoming a score to my own miserable thoughts, giving them beauty as only music can."

'Blóðberg' is out now on Krunk.