Dave Grohl has been inspired by the history of American music.
The Foo Fighters frontman travelled the US interviewing fellow artists from across the nation as part of the band's new album - and accompanying HBO documentary.
Dave Grohl has revealed the group's next album has been inspired after discovering the roots of American music.
He told Billboard magazine: "After making 'Sound City', I realized that the pairing of music and documentary works well because the stories give substance and depth to the song, which makes for a stronger emotional connection.
"So I thought, 'I want to do this again, but instead of just walking into a studio and telling its story, I want to travel across America and tell its story.' "
It means the 'My Hero' hitmaker has been influenced by a range of styles for his group's next album - and their direction will "surprise" fans.
He explained: "As we were coming down from the success of the last record, I thought, 'Now we have license to get weird'.
"If we wanted, we could make some crazy, bleak Radiohead record and freak everyone out. Then I thought, 'F**k that.'
"[The goal is to make stadium anthems that startle. Instead of just] banging out these big choruses, because that's what we do, we're banging them out in the middle of instrumental sections that will take you by surprise. The music is a progression or an evolution, for sure, but it's a Foo Fighters record."
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