Walls and Bridges (SHM CD)By the summer of 1974, John had been living apart from Yoko for nearly a year. Quartered in Los Angeles he entered a boisterous spell tagged Lennons Lost Weekend. Like its predecessor Mind Games, the new album would be self produced. As to the musicians, among familiar names like Jim Keltner, Klaus Voormann and Nicky Hopkins and a couple of luminary guests that included Nilsson and the hottest rock star of the moment, Elton John. It was Elton who