In retrospect, it makes sense that backing Bassey would prove formative: So much of Led Zeppelin was about power, poise and drama (or melodrama, if you think of the first album's overwrought "Babe I'm Going to Leave You").

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

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.

New documentary "Becoming Led Zeppelin" traces the journey of the legendary band's four members from their humble musical roots to their groundbreaking success in America. (Feb. 21)

No band has a greater mystique than Led Zeppelin. Now, a stunning new documentary goes inside that legend and traces their origins.

But as any superfan will tell you, "Becoming Led Zeppelin" ends when things are just about to get interesting: a pivot to acoustic folk, a plunge into drug abuse and