Metallica are set to play at a school charity gig in California next month.
They've joined Tom Waits, Regina Spektor and John Mayer on the bill for Neil Young's Bridge School concert.
The annual gig raises money for the Bridge School, which helps mentally and physically handicapped children.
It first kicked off in 1986 by Young and his wife, who host it every year.
It's also renowned for its high-profile line-up, and last year's performers included Dave Matthews Band, Pearl Jam and the Foo Fighters.
This year's concert will be held at the Shoreline Amphitheatre in Mountain View on October 27 and 28.document.write(unescape("