A few more details on the upcoming Foo Fighters documentary series surrounding their new album have surfaced, with the band revealing a few guests and a tentative timeline for both the album and series' release. In addition, frontman Dave Grohl has offered more details on the direction of the new disc.

In a new interview with Billboard, it's revealed that by shooting the HBO documentary series chronicling the making of the album in a variety of U.S. cities, the band was afforded the opportunity to work with several hometown musical heroes at each stop.

Cheap Trick guitarist Rick Nielsen, who worked with Grohl on the 'Sound City' documentary, was a guest during the band's Chicago stop, while new guitar hero Gary Clark Jr. lends some licks during a stop in Austin, Texas. Country superstar Zac Brown, whose album Dave Grohl just produced, joins the band in Nashville and Joe Walsh sits in during a session in Joshua Tree, Calif. And, as was recently reported, Trombone Shorty and the Preservation Hall Jazz Band played with the band during a stopover in New Orleans.

Grohl tells Billboard, "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."

The frontman adds that after the success of their last album, it took a little bit to decide what to do next, but once the idea presented itself, he found his way. He explains, "As we were coming down from the success of the last record, I thought, 'Now we have a license to get weird. If we wanted, we could make some crazy, bleak Radiohead record and freak everyone out. Then I thought, 'F--- that.' … [We just started] 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."

While Foo Fighters previously stated that the new record would arrive this fall, a source tells Billboard that a November release is probable, with the HBO series arriving around the same time.