By early 1969, The Beatles had more than their share of problems. In the Let It Be documentary, viewers see some of these issues play out in front of the cameras. But the band still had a lot left in the tank.
When the Fab Four plays on the roof of Apple studios at the end of the film, you see Paul McCartney and John Lennon get swept up in the performance. John seems particularly exuberant during the set, which included his funky guitar solo on “Get Back.”
That track, written by Paul, represented everything he’d wanted for the band in this period (“As live as live can be in this electronic age … The Beatles, as nature intended,” a press release written by Paul said). But the song’s subject matter became a source of controversy later.
Originally conceived of as a “racial satire,” Paul eventually settled on the harmless-enough tale of Jojo and Loretta. Looking back on the track a decade later, John saw it as a message Paul had directed at Yoko Ono.
Source: cheatsheet.com