By Joey Nolfi
September 25, 2016 at 03:14 PM EDT
Prince Williams/WireImage; Tim Mosenfelder/Getty Images

Kanye West surprised audiences at Chance the Rapper’s Magnificent Coloring Day festival over the weekend when he joined the 23-year-old onstage to perform a series of hits on Saturday afternoon.

“Chance,” West said, addressing the rapper as he took the stage at Chicago’s U.S. Cellular Field. The crowd of nearly 440,000 fans around them erupted with applause. “I’m so proud of this young man right here.” 

Yeezy launched into performances of cuts from past studio albums, like “Black Skinhead,” “Can’t Tell Me Nothing,” “Touch The Sky,” “Gold Digger,” “Father Stretch My Hands Pt. 1,” “Pt. 2,” and a verse from the Schoolboy Q track “That Part.” He later performed “Ultralight Beam” from his latest LP, The Life Of Pablo, alongside Chance. 

In numerous videos posted to Twitter, fans can be seen rushing the stage during West’s set.  

when kanye shows up at #MCD @chancetherapper @kanyewest

— joe aronson (@joearonson2) September 24, 2016

Additionally, local news reported Common, Hannibal Buress, and the Chicago Bulls’ Jimmy Butler made previously unannounced appearances at the event as well. 

Watch West and Chance the Rapper’s full performance below.