John Fogerty has been taking part in some interesting collaborations lately. The former Creedence Clearwater Revival frontman joined Widespread Panic for a stellar half set at the inaugural Lockn’ Festival last weekend, and earlier this year he played a few gigs as a member of Dave Grohl’s Sound City Players supergroup. Now the legendary performer can add another unexpected collaborator to his resume—Mumford and Sons.

JamBase is reporting that Fogerty made a last minute appearance at the group’s “Gentlemen of the Road” stop in St. Augustine, FL last night after fun. were forced to cancel their performance. Fogerty apparently showed up for an eleventh hour rehearsal before playing a set with Mumford & Sons and members of The Vaccines as his backing band. The group put their spin on a number of CCR classics like “Bad Moon Rising,” “Down on the Corner,” “Proud Mary” and “Have You Ever Seen The Rain,” with many of the songs turning into Fogerty-led sing-alongs.

The Mumford and Sons guys seemed to very happy with the last minute arrangement. The band looked like they were having a ball on stage, and frontman Marcus Mumford even told the crowd that he was cool with fun.‘s cancellation “because John Fogerty was fucking awesome.”