While John Lennon insisted the title was aimed at Yoko Ono, whose constant presence in the studio created tension with Paul McCartney, McCartney said the song was a commentary on British immigration bills. Famously performed on the roof of the Apple Records building -- the band's last live performance together -- it featured Billy Preston on organ and Lennon on slide guitar. "When Paul was feeling kindly, he would give me a solo!" Lennon told Rolling Stone not long after the band's breakup. "Maybe if he was feeling guilty that he had most of the A side or something, he would give me a solo."