Foo Fighters

Dave Grohl and Justin Timberlake

Dave Grohl Announces Justin Timberlake as the "Mystery Pop Star" on New 'Concrete And Gold' Album

After Dave Grohl announced that the "biggest pop star in the world" would be appearing on the new Foo Fighters album, Concrete and Gold , everyone couldn't help but guess who it could be. Lady Gaga ? Beyoncé ? Taylor Swift ? Adele ? Katy Perry ? Justin Bieber ?
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