Tonight's show offers a dizzying (and bicoastal) array of psychoactive rock. Representing the West Coast are Black Mountain (Vancouver, BC) and Howlin' Rain (San Francisco); from back East come Brooklyn bands Yeasayer and MGMT. Black Mountain deals in druggy classic-rock dirges, Yeasayer in oddly hopeful millennial gospel. But most exciting is MGMT, a young duo who met at Wesleyan College. Their tripping ranges from liberal-arts-school noise jams to poppy, polished psych-funk to bleary-eyed ante meridiem folk. (Neumo's, 925 E Pike St, 709-9467. 8 pm, $12, 21+.)