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In 1995, the bright light of free jazz shined on hard-bop cornetist Rob Mazurek, and he has explored the possibilities of chance ever since. Mazurek is a ubiquitous presence in the Windy City’s talented (and incestuous) improv-rock and jazz scenes. He’s made guest appearances on Tortoise and Gastr del Sol CDs, plays in the avant-funk outfit Isotope 217, and leads the Chicago Underground Orchestra and its offshoots, the Chicago Underground Duo (with drummer Chad Taylor) and Trio (with Taylor and bassist Noel Kupersmith). The Duo’s debut, 12° of Freedom, takes many of its cues from Don Cherry and Ed Blackwell’s celebrated duets and is an impressionistic beauty. See the Duo as a trio (but not the Trio) when it is joined by Tortoise and Orchestra guitarist Jeff Parker, along with Brokeback (featuring Tortoise bassist Doug McCombs) and Gloss at 10 p.m. at Metro Cafe, 1522 14th St. NW. $7. (202) 518-7900. (Christopher Porter)