Twenty years after first hitting the 'Saturday Night Live' stage with Nirvana, Dave Grohl and his Foo Fighters will join Arcade Fire as the backing bands for Mick Jagger when the Rolling Stones singer performs on this season's final 'SNL' episode. NBC will air the  show, which Jagger is also hosting, on May 19.

It's not quite clear what they all will be performing -- Jagger's latest album, with the supergroup SuperHeavy, dropped last year and there's no indication those musicians will take part -- but regardless, these surprise collaborations should be worth tuning in for. Perhaps the gig will finally get people talking about something other than Gotye's stellar 'SNL' performance from earlier this season.

Amazingly, the show will be Grohl's 11th 'SNL' appearance (or maybe it's his 10th?), having previously rocked the Studio 8H stage with Nirvana, Foo Fighters, his Them Crooked Vultures supergroup and as drummer for Tom Petty. Arcade Fire performed on 'SNL' in 2007 in support of their second album, 'Neon Bible.'

Not surprisingly, the rumors that Jagger's Stones bandmate will make a surprise appearance on the show as well have already begun. With the Foos and Fire already lined up, that would be quote a crowded stage, so we wouldn't hold our breaths. On the other hand, that's exactly the kind of coup 'SNL' producer Lorne Michaels is known for pulling off.