The eight songs extended beyond the length of a conventional album, almost spanning three sides of an LP, so the group decided to create a double album, adding material they had recorded for previous albums but never issued. This included various jam sessions such as "Boogie With Stu", which Page thought would be unsuitable as a track on a single album. Additional overdubs were laid down, and the final mixing of the album was performed in July 1974 by Keith Harwood at Olympic Studios, London. The title "Physical Graffiti" was coined by Page to illustrate the whole physical and written energy that had gone into producing the set.