Chicago rolls deep. Supremely chill Chicago rockers played Lollapalooza at Grant Park yesterday, and they brought a friend along. Joey Purp, one of the leading lights of the Chicago rap scene, joined the band onstage to freestyle during their performance of instrumental cut "Red Moon." Watch their collaboration below.
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Watch Whitney Perform With Joey Purp At Lollapalooza

Joey Purp performs at FYF Fest Day 3 at Exposition Park on Saturday, July 23, 2017, in Los Angeles. (Photo by Colin Young-Wolff/Invision/AP)
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