To coincide with Jonsi Birgisson's solo project, he and composer Nico Muhly (Grizzly Bear, Antony and the Johnsons) have filmed a video for the new song 'Kolnidur.' The clip simply features the two on guitar and piano, performing the piece together. 'Kolnidur' is one of nine tracks off of the Sigur Ros frontman's upcoming release, 'Go.'

As previously reported, 'Go' will be released digitally on Apr. 6, along with a limited-edition box set. On that same day, Jonsi will be embarking on a North American tour in support of the release. Watch the exclusive premiere of the 'Kolnidur' video after the jump.