Foo Fighters have enlisted Paul McCartney to play drums on their upcoming LP Concrete and Gold. In a new interview with ET Canada, the band revealed how McCartney recorded on one of the album’s tracks. “He hadn’t even heard of the song. He comes in and Dave picked up an acoustic and showed him real quick,” an unspecified member of the band said. “He sat on his special drum set that his tech set up for him. I sat there with a drumstick conducting. He did two takes.” Previously, frontman Dave Grohl teased “the biggest pop star in the world” is featured on the project. However, Grohl clarified that McCartney is not the star guest: “He or she sings backup on one of the heaviest songs on the record. And we’re not telling anybody who it is.”

McCartney previously collaborated with Grohl and two other former Nirvana members (bassist Krist Novoselic and current Foo Fighters guitarist Pat Smear) on "Cut Me Some Slack" for Grohl's 2013 film, Sound City. McCartney also played the song with Grohl, Novoselic, and Smear at a 2012 benefit concert for the victims of Superstorm Sandy in New York.

Concrete and Gold arrives September 15 via Roswell/RCA. The Greg Kurstin-produced record also features “Run,” which debuted with a crazy Dave Grohl-directed video. Foo Fighters are currently on the road—find the full dates here. Their new music festival, Cal Jam ‘17, will feature performances from Queens of the Stone Age, Liam Gallagher, Japandroids, and more. Foo Fighters’ last release was 2015’s Saint Cecilia EP. In 2014, they shared their Sonic Highways LP.