Full of never-before-seen footage of the band’s first 18 months, interviews with John Paul Jones, Jimmy Page, Robert Plant, and new audio from the late John Bonham, the first authorised documentary about the best hard rock band to ever do it assumes a lot about what its audience already knows.

Becoming Led Zeppelin is already nearing $6 million in international box office gross. In an era where most documentaries head straight to streaming, the rock doc's box office run – not the mention the fact that it's playing on IMAX screens – is a small coup.

DECIDER spoke to director-writer Bernard MacMahon and producer-writer Allison McGourty about this project that was decades in the making.