Eight years in the making, Santa Cruz, California's reclusive sons of tectonic riffage Mammatus return with Expanding Majesty, a sixty-nine minute magnum opus of kaleidoscopic guitars, soaring analog synths, wall-of-amps fuzz bass and one hundred feet drums. Four side-long pieces unfold across a double album in unstoppable riffs that span the meditative and joyful un-earthed flight of '70s kosmische godfathers like Popol Vuh and Tangerine Dream to the kinds of sub-surface thunder pioneered by Melvins and Sleep.