J. Cole performed in Chicago Thursday (Sept. 4), where he served as the headliner at the University of Illinois-Chicago's Spark in the Park 2014 festival. During his set, the Roc Nation rapper invited fellow Chi-City rhymer Chance the Rapper to perform their previously-unreleased collaborative track 'Thotty.'

Although Chance has been teasing the track since March, this is the first time the duo has performed it together live in concert. The song features Cole and Chance rapping about thots hollering at them through social media.

There's no word on whether Chance will officially release a CDQ version of the song, but from the fans' reaction at the Chicago show, it sounds like a winner.

If you want to hear a clear preview of the song, listen to it below.

Listen to Chance the Rapper's 'Thotty'