Kanye West and Vic Mensa Performed a Surprise Set During Chance the Rapper's "Open Mike" Event

Some lucky high schoolers got to see "All Day" live.

Chicago high schoolers at Chance the Rapper's "Open Mike" event were blessed tonight with a surprise performance from Kanye West and Vic Mensa. The Chi-Town MCs hit the stage to perform "All Day" and "U Mad," and the kids in attendance went appropriately nuts. 

Watch more clips from the performance below. 

"All Day"

"U Mad" 

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