Kendrick Lamar and Chance the Rapper Crash Earth, Wind, and Fire Bonnaroo Set

No one saw this coming.

Bonnaroo attendees who stuck it out in the scorching heat were gifted with a big treat during Earth, Wind, and Fire's set. Kendrick Lamar and Chance the Rapper (potentially raps greatest tag team) hit the stage to spit freestyles with the legendary juggernauts.

The collaboration was reportedly not planned, with Kendrick and Chance only joining the band after an impromptu invitation from Verdine White and company. Their stage crash made the performance 20 minutes longer and had the Internet in a frenzy. Watch clips of their performance below.