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.

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