In a recent interview, Foo Fighters front man Dave Grohl gave some hints on what to expect on the band's new album, Concrete and Gold.
“There’s one who is probably the biggest pop star in the world – and I’m not kidding. They sing back up on one of the heaviest songs on the record and we’re not telling anyone who it is.”
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My two guesses: Justin Timberlake (because why not, damnit?) or Taylor Swift. I'm leaning for more towards Taylor Swift because of this story about her helping Dave Grohl remember his own damn song. Refresh your memory HERE!