I've been pointed at a new (to me) source of Progressive Psychedelic Drone Post-Rock[1]. If you remember Gong, Ozric Tentacles, Schpongle or like Mogwai and Om, check out everything from White Hills and Gnod, and the collaborations they've done together.

[1]How's that for sub-genre-ifying?1 Trinity Rd, Ware, Hertfordshire SG12 7