At 2pm today Peggy Nelson (otolythe) presents Weirwood:

Upon learning that the Weirwood trees in Game of Thrones were named after Bob Weir of the Grateful Dead, I set out to make an ambient soundscape about our long strange trip. The interiors of birch branches form the base. Over them I used field recordings from Yellowstone, and a cold tide on a black sand beach, grabbed with buried hydrophones. Then I stretched out a cello playing a few notes until the changes in tone were almost imperceptible, and finally wove in the audio illusion of Shepard tones. Providing color commentary is NASA’s John Glenn.