 The four played together for the first time in a room below a record store on Gerrard Street in London. Page suggested that they attempt "Train Kept A-Rollin '", originally a jump blues song popularised in a rockabilly version by Johnny Burnette, which had been covered by the Yardbirds. "As soon as I heard John Bonham play", Jones recalled, "I knew this was going to be great ... We locked together as a team immediately". Before leaving for Scandinavia, the group took part in a recording session for the P. J. Proby album, Three Week Hero. The album's track "Jim's Blues", with Plant on harmonica, was the first studio track to feature all four future members of Led Zeppelin.
