Led Zeppelin has announced the band's first officially sanctioned documentary. The 50th anniversary film is currently in production, with the still-untitled film being directed by British filmmaker Bernard MacMahon, best known for his sprawling documentary on the birth of the American song, titled American Epic. The film, which has no release date, will only feature surviving members Jimmy Page, Robert Plant, and John Paul Jones telling the story -- with "no outside voices or conjecture."

Jimmy Page said in a statement announcing the project, "When I saw everything Bernard had done visually and sonically on the remarkable achievement that is American Epic, I knew he would be qualified to tell our story." Robert Plant added: "Seeing Will Shade, and so many other important early American musicians, brought to life on the big screen in American Epic inspired me to contribute to a very interesting and exciting story."

John Paul Jones went on to say: "The time was right for us to tell our own story for the first time in our own words, and I think that this film will really bring that story to life."

The Guardian posted that unlike most docs, which span the entire career of a band, "MacMahon will focus on their development and rise to fame, as the three members each left session work and existing bands to come together in 1968, along with late drummer John Bonham. The film will chart their career until 1970, as the second album, released the previous year cements them as the dominant rock band of the era." No release date has been announced.

Jimmy Page says that pretty much from the onset of Zeppelin's career, the size of the venues grew to the point that the only place they could satisfy the demand was to play in the open air: "Right from the beginning of it, within a few months, going in to 1969 -- we can't supply the demand, that everywhere we play is full. And we start doing repeat nights it was full, full, full. So, when we're doing outside events, it wasn't confined by the four walls and you can see that it was just immense. All the way through -- all the way to 1980, we were just getting huge crowds coming in. It just kept appearing to get larger and larger."

AUDIO: JIMMY PAGE ON LED ZEPPELIN PLAYING TO MASSIVE CROWDS