Have you ever been near the abdomen of a dyspeptic hippopotamus? If so, you can imagine the monolithic dirge-gurgle of Sunn O)))'s The GrimmRobe Demos. This was the renowned L.A./NYC group's debut album—essentially a tribute to Seattle ambient-metal pioneers Earth's tectonic-plate-shifting Earth 2. Tonight, Sunn O))) will re-create GrimmRobe's morose, down-tuned majesty, probably with dense clouds of dry ice and amps the size of your apartment. Expect Richter scale–maxing epicness. (Neumos, 925 E Pike St, 709-9467. 8 pm, $15, 21+.)