18. Cee-Lo Green Surprises Foo Fighters

At Hangout Festival in Alabama in 2011, Foo Fighters showed everyone what awesome guys they all were. When Cee-Lo Green didn’t make an appearance for his set, the 5-man rock band willingly stepped in to play Green’s slot and their slot, which was after Green’s. After a few songs, however, Cee-Lo Green surprised everyone by grabbing a mic and performing an impromptu collaboration with Foo Fighters, a memorable Darling Nikki cover.

17. Arcade Fire’s Festival of Luminous Balls

Wrapping up Coachella 2011’s Saturday, Arcade Fire stunned the crowd with their impeccable performance of Wake Up, which was enchantingly complemented by a festival of white luminous balls cascading over the sea of concertgoers.