It sort of happened.

The Foo Fighters played a small secret show in Tarzana, California last Tuesday night for roughly 500 fans. At one point in the show, singer Dave Grohl was joined on the stage by the other surviving members of Nirvana, Krist Novoselic and Pat Smear. The trio then played the Nirvana song “Marigold” which was a B-side from the “Heart Shaped Box” single. It was the only song the band ever put out which featured Grohl taking the vocal duties.

The Foo Fighters have a new album coming out soon which was produced by Butch Vig (notable from the Madison band Garbage), the same guy who produced the classic Nirvana album Nevermind. Novoselic is apparently featured on one of the tracks as well.

Thanks to The Sound Loft.com