By the time Led Zeppelin released Physical Graffiti in 1975, they no longer needed to prove anything. “All of us knew that it was a monumental piece of work, just because of the various paths that we’d trodden along to get to this,

A new documentary about the band’s early days offers a rich backdrop to an unlikely performance of a star on the rise.

As Zeppelin’s guitarist and leader Jimmy Page said: “The whole of the history of Led Zeppelin is musical expansion.” And in Physical Graffiti, the full scope of Zeppelin’s music was revealed. “It gives all the different colours and textures,” Page said.

Led Zeppelin scores a pair of top 10 hits, as "Stairway to Heaven" returns at No. 8 and "Whole Lotta Love" debuts at No. 9 on the Hard Rock Digital Song Sales chart.