John Lennon, George Harrison, Paul McCartney and Ringo Starr pictured in 1964© Fox Photos/Getty Images The Beatles perform on the rooftop of the Apple offices at Savile Row, London in January ...

During the process of creating one hit song on the The Beatles album Revolver, Paul McCartney grew so frustrated that he ...

Beatles history is full of stories about Paul McCartney’s dual life as a bassist and guitarist. After getting saddled with the instrument when Stuart Sutcliffe left the group in July 1961 ...

From left: George Harrison, John Lennon, Paul McCartney and Ringo Starr. Bettmann/Getty In December, McCartney and Starr, 84, reunited on stage for the first time in five years .

From left: George Harrison, John Lennon, Paul McCartney and Ringo Starr. In December, McCartney and Starr, 84, reunited on stage for the first time in five years.

Paul's mom died of complications from breast cancer in 1956, while John's mom was hit by a car in 1958. The latter put the band's music on hold for a while — until George brought them back ...

At the Liverpool Institute, Paul reconnected with an old school friend, George Harrison, and soon after, met John Lennon. "You saw him rather than met him," Paul once said of John.