Justin Timberlake Is the 'Biggest Pop Star in the World' Guest on the New Foo Fighters Album

Brantley Gutierrez
Foo Fighters

Since June, Foo Fighters chairman Dave Grohl has been teasing the fact that the band’s upcoming album Concrete and Gold includes a guest turn from “the biggest pop star in the world.” In the weeks that followed, Grohl shot down the Taylor Swift and Adele rumors that had emerged. According to a new Rolling Stone profile about the band, the mystery guest on Concrete and Gold is Justin Timberlake.

Here’s Rolling Stone’s description of Timberlake and Grohl’s interactions:

[Timberlake] listened to what the Foos were doing and liked what he heard, and pretty soon he and Grohl were hanging out regularly. “We’d drink whiskey in the parking lot,” Grohl says. “He was really, really cool. Then the night before his last day, he says, ‘Can I sing on your record? I don’t want to push it, but -- I just want to be able to tell my friends.’ ” So the band had him add some “la la la’s” to one track. “He nailed it,” Grohl says. “I’m telling you -- the guy’s going somewhere.”

Whiskey? Parking lots? “La la la”s? What a couple of wild and crazy guys!

Concrete and Gold is also set to feature Paul McCartney on drums and a 30-voice choir overdubbed by Boys II Men’s Shawn Shockton. The album is out next Friday (Sept. 15); read Spin's roundup of everything we know about it so far here.

This article originally appeared on Spin.