This three-CD, nearly four-hour slab of music is more like an environment than a composition. The ensemble features brass, guitar, and up to four basses, plus Sorey on drums, dungchen (a long Tibetan horn), trombone, and conduction — meaning, guiding the improvisation rather than leading the group through a score. It starts with a massive drum solo, but then becomes both atmospheric and ritualistic, one sonic event following the next on a time scale that makes any attempt to impose structure a fool’s errand. Just sit back, get comfortable, and let it happen to you.