The Beatles achieved worldwide fame, with McCartney playing bass guitar and piano, and sharing primary songwriting and lead vocal duties with John Lennon.

The release of Sgt. Pepper's Lonely Hearts Club Band marked a significant creative shift for the Beatles, with McCartney playing a key role in incorporating experimental aesthetics into their studio productions.

John Lennon privately left the Beatles, though the information was not made public to avoid jeopardizing ongoing business negotiations.

McCartney announced his departure from the Beatles, leading to the band's eventual dissolution.