It’s been four years since SUNN O)))’s last full length, Monoliths and Dimensions. Ulver’s most recent album, Messe I.X.VI.X came out earlier this year. Both bands have been pushing the sonic envelope recently, evolving from drone metal to ambient, classical acoustic, and otherwise unclassifiable music. The two entities first worked together in 2003, for SUNN O)))’s White1 sessions, which yielded the Ulver-produced “CutWOODED.” 11 years after their first collaboration, the two have announced that they’ll be collaborating next year via the simple words “SUNN O))) & ULVER 2014.

The band’s collaborative work, Terrestrials, will be out in February 2014 on Southern Lord. Here’s what SUNN O))) had to say via their website:

Today it comes with great pleasure to confirm that these words, SUNN O))) and Ulver, together, represent an astonishing yet somehow totally tenably matrimony of these two earthshakingly powerful forces, coming together like tectonic plates.

The result of this union is a three-track recording entitled Terrestrials, three movements which are fluid like the flow of magma beneath the Earth’s crust, sonically uninhibited, unpredictably cosmic, haunting and stirring yet simultaneously ceremonious and beautiful.

Southern Lord shall release Terrestrials in February 2014,

Over the course of the next month we shall be revealing the story of how this alliance and recording came to be, revealing the insight of the musicians involved, attempting to answer some of the burning questions which we have, for now, left hanging in the air.

Southern Lord shall release Terrestrials in February 2014.