Rappers Kendrick Lamar and Chance The Rapper made a surprise performance with Earth Wind and Fire on Friday night.
The two MCs joined the band onstage and spit freestyles during the second night of the Bonnaroo Music Festival.
As soon as the collaboration began, Kendrick's Top Dawg Entertainment label-mate SZA posted video of the performance as many fans did the same.
And shortly after, Chance took to Twitter to provide fans the back-story of how the collaboration came to be.
Watch the full surprise performance below (1:15:00):
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