The Song Remains the Same - Live: O2 Arena, London - December 10, 2007

The lyrics are based on Robert Plant's belief that music is universal. He told NME in 1973: "Every time I sing that, I just picture the fact that I've been round and round the world, and at the root of it all there's a common denominator for everybody. The common denominator is what makes it good or bad, whether it's a Led Zeppelin or an Alice Cooper."

The title was used for a concert film and soundtrack released in 1976. Footage from three 1973 Madison Square Garden shows was mixed with scenes of the band acting out their "fantasies." The band was not happy with the results.

A live favorite, Led Zeppelin used this to open concerts during their 1977 US tour.