The performance was completely unplanned and unrehearsed. The band and the rappers had an impromptu freestyle. Although the set was planned for 70 minutes, EW&F bassist told USA Today that they stayed onstage for an additional 20 minutes.
Lucky for us, the people who were lucky enough to see it live, happened to record it to share with us.
kendrick lamar and chance the rapper join earth, wind and fire on stage at bonnaroo pic.twitter.com/NXZzGmmg7g
— illroots 4 the kids (@illroots) June 13, 2015