Billy Preston Portfolio: "At the time, the Beatles were heavily into the making of Let It Be, which was becoming a very unhappy chore because of tensions in the group. George brought Billy in to play keyboards on some of the tracks, as the orginal idea of Let It Be was to be a 'live' recording with no overdubbing, which left none of them to add things like a keyboard part. But, George also hoped that bringing in an outsider would make the others behave nicer and make the Let It Be set a happier place to be, and it worked, albeit temporarily. The Get Back single was credited as 'The Beatles with Billy Preston', the first time another artist was credited on a Beatles record, gaining him the title in some circles as 'the fifth Beatle'. In addition, although you can barely see it in the Let It Be movie, Billy played with the group on the famous 'Rooftop Concert', the Beatles last live appearance together."