In Lewisohn's opinion, "Sgt. Pepper" represents the group's last unified effort, displaying a cohesion that deteriorated immediately following the album's completion and entirely disappeared by the release of "The Beatles" (also known as the "White Album") in 1968. Martin recalled in 1987 that throughout the making of "Sgt. Pepper", "There was a very good spirit at that time between all the Beatles and ourselves. We were all conscious that we were doing something that was great." He said that while McCartney effectively led the project, and sometimes annoyed his bandmates, "Paul appreciated John's contribution on "Pepper". In terms of quantity, it wasn't great, but in terms of quality, it was enormous."