Dave Grohl has been back in the studio with former Nirvana bass player Krist Novoselic and Garbage's Butch Vig.
The trio are rumoured to be working on the Foo Fighters frontman's new documentary on Sound City Studios, where Nirvana's seminal album 'Nevermind' was recorded with Vig on production duties.
Announcing the hook up on his Twitter page, Vig wrote:
The last 24 hours have been surreal! Had a great gig at the El Rey last night, and spent today recording with Dave, Krist and special guest!
It is not yet known who the mystery "special guest" is. The trio previously came to work together on the last Foo Fighters' last album, 'Wasting Light', which was recorded by Vig and featured Novoselic. Foo Fighters have confirmed that they will begin work on a new album this year.
Last year, it was announced Vig's former band Garbage are set to reform with a self-released album, 'Not Your Kind of People' to be released on May 14 followed by a UK tour in July. It is the band's first new studio material since 2005's 'Bleed Like Me'.
Novoselic has been active in US politics in recent years and wrote the book 'Of Grunge and Government: Let's Fix This Broken Democracy'.