Led Zeppelin, often hailed as the Godfathers of Heavy Metal alongside Black Sabbath and Deep Purple, were influenced by more than just heavy riffs. The band's deep love for blues, with artists like Howlin' Wolf and Muddy Waters, shaped their sound. This documentary also explores Robert Plant's songwriting inspiration from J.R.R. Tolkien’s Lord of the Rings and Jimmy Page's fascination with the occult.