Dave Grohl says stars were lining up to appear in 'Sound City: Real To Reel'.

The Foo Fighters rocker was surprised he didn't have any trouble convincing some of music's biggest stars to take part in the16-day shoot for his documentary about the iconic Los Angeles studio.

He explained: ''I said to the people at Sound City, 'Give me a list of every record that was made at the studio'. They stared at me and said, 'That's impossible. There were a million records made here'. So I said, 'Okay, give me a shortlist of big ones'.

''And I started calling everyone from Rick Springfield and Rick Nielsen to Neil Young and Tom Petty. Because of what Sound City represented, every single one of those people wanted to be in the movie. I didn't have to beg anybody.''

Dave invited 80s rockers Ratt to take part and although the band's sound is very different to Dave's own, he refused to discredit them and thought it was important to include the 'Round and Round' chart-toppers in the history of the studio.

He told Classic Rock magazine: ''I think they were surprised too. They made 'Out of the Cellar' at Sound City, and it's an iconic album - there were hits on that record. When the guy from Nirvana calls someone from a metal band from the 80s, there's a minute or two of sideways glances. It's like two cowboys stepping out of a bar, gunslings ready for a shoot-out.

''But anybody that knows me knows that I can sit down and have a pint with anybody. Music is music. I don't believe in guilty pleasures. So when I asked the Ratt guys, they were like, are you sure? I'm like, 'C'mon, you made that huge record at Sound City. Let's go!' And they were f**king awesome.''