Foo Fighters front-man Dave Grohl joined The Rolling Stones on stage at the Stones' concert in Anaheim, California.  Grohl played guitar and took sang with Mick Jagger on Bitch from the band's Sticky Fingers album.

The on-stage collaboration is not surprising.  On the Rolling Stones' current tour, John Fogerty, John Mayer, Katy Perry, and other high profile musicians have joined the band on stage.

Dave Grohl appears to be on a mission to play with every band to ever exist.  He's almost done with the legendary British classic rock bands, now.  In the past, Grohl has played with The Beatles' Paul McCartney, and John Paul Jones and Jimmy Page of Led Zeppelin.