These symbiotic pranksters–progenitors of a thousand laptop-owning sample freaks, mash-up artists, and pomo manifesteers–just celebrated their 25th anniversary. They’ve remained cunningly below the radar during that time–their infamous early-90s legal battle with U2 and Island Records demonstrated the risk of flying above it without stealth technology–but have never had much of a lapse in productivity. Their latest, It’s All in Your Head FM, is a double-disc collection of live recordings from their current stage show, which they’re bringing to town as part of Chicago Public Radio’s Third Coast International Audio Festival. Much of the performance is drawn from the group’s long-running radio series, Over the Edge, including the bits that relate to Dr. Oslo Norway of One World Advertising, who tries to use his public platform to prove that there is no God–all for the sake of ratings. a 10 PM, Lakeshore Theater, 3175 N. Broadway, 773-276-3600 or 866-468-3401, $15. A