Chance the Rapper brings out "The Pied Piper of R&B" for his set during the Chicago music festival.
R. Kelly continues to keep the crowd hype. Despite his recent boot from an Ohio show, "The Pied Piper of R&B" was met with dancing and cheering when he performed a surprise trio of songs during Chance the Rapper's set at Lollapalooza this weekend.
"This is my city," Chance told the audience at Chicago's Grant Park. He was on a bigger stage than his appearance last year, and he yielded it to Chi-Town's favorite controversial son.
Kellz delivered renditions of "The World's Greatest," "Bump N' Grind" and "Ignition (Remix)."
The Acid Rap MC performed his buzz-building songs "Everybody's Something, "Smoke Again," "Cocoa Butter Kisses" and "Wonderful Everyday: Arthur" (the latter of which he just released as a single featuring a mash up of artists including Wyclef Jean and Elle Varner).
He also brought out fellow rising Chicago star Vic Mensa.
"I see you turning up this whole time," Chance said just before his final song of the night, "Chain Smoker." And, referring to the fans watching on his Lollapalooza and Red Bull-supported live stream, he added, "They know this is our city."
Concertgoers got yet another major surprise at the festival. During Eminem's set, he brought out Rihanna to sing the vocals on his "Stan" and their collaborative hits, "Love the Way You Lie" and "Monster."
The two launch their Monster tour Aug. 7 at the Rose Bowl in Los Angeles.
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(Photo: Raymond Boyd/Getty Images)