[…] By the end of the band’s third American tour, two more sections had been introduced: a unique riff section with another call and response with Plant as well as the Mars: The Bringer of War section. The former would essentially remain intact before being dropped in 1971, while the latter would become a mainstay from this point forward. Based off of the movement of the same name from Gustav Holst’s The Planets suite, this section would follow the fast guitar solo. […]