Today’s 12 O’Clock Track, “Western Horn,” comes from the collaborative album between Sunn O))) and Ulver that dropped on Southern Lord earlier this year entitled Terrestrials. If you’re at all familiar with the great drone of Sunn O))) and the dark experimentation of Kristoffer Rygg and Norway’s Ulver, then, as you might expect, the track is a kind of freebase improv that grows tenser and tenser with each passing minute (a little over nine in total). The “pace” is kept by an intermittent, subterranean thud that acts like a finger touching a still pool of water, sending ripples out in the forms of faint and haunting squeals. The coalescing of sounds seems to grow louder as the track progresses, which is a bit true and a bit your paranoia getting the best of you.