(MUSIC COMPETITION) The most convenient, and funniest, source of samples is the human corpus. That's the concept that catalyzes Seattle School's Pop Smear Test: Get opposing electronic musicians to sample myriad body sounds from audience members and then manipulate said emissions with high-tech gear to form a new track—in five minutes. The judges determine the winner of each round through their own involuntary bodily responses, which are monitored by nurses. Tonight's contestants are local electronic players/producers Obelus and ndCv. (Chop Suey, 1325 E Madison St, 324-8000. 8 pm, $5, 21+.) DAVE SEGAL