Yesterday afternoon Corbett vs. Dempsey hosted a free concert by reedists Ken Vandermark and Mats Gustafsson. Introducing the performers, gallery co-owner John Corbett noted that Sweden’s Gustafsson first came to Chicago 19 years ago to perform, and that while he’d been back dozens of times since then, developing deep ties to the city, he’d never actually spent any time here when he wasn’t playing music—until his current trip. Still, Corbett convinced him to play one killer set with Vandermark, one of this longest-lived and closest collaborators.