Gambino, the rap alter ego of actor Donald Glover, showed up Monday for Chance's Open Mike event for high school students in the Windy City.
The rapper co-hosted the event with Malcolm London.
London tweeted video of Chance on stage talking to an audience of youth gathered at the Harold Washington Library Center.
"My next guest needs no introduction," Chance says before the opening of Gambino's hit song "This Is America."
Attendees rushed the stage as Gambino appeared and began dancing and rapping.
Chance the Rapper and Gambino are longtime friends.
Gambino has been riding high with his hit single that spurred a viral video.
On the acting side, Glover's FX series, "Atlanta," was recently renewed for a third season.
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