Generally speaking, The Beatles had a run that spanned about a decade from 1960 to 1970, and in those 10 years, the Fab Four released 13 studio albums, toured the world a couple of times, starred in motion pictures, gave up touring in 1966 to become an even more successful studio band, and touched the global population with their evolving creativity. Yet by the end of the 1960s, the band succumbed to bitter internal disagreements amongst themselves, resulting in that beautiful era coming to a close.
Behind the scenes, John Lennon was the first to quit The Beatles in September 1969 before they officially announced their disbanding in 1970. After they broke up, Lennon and Paul McCartney found themselves caught up in a long-lasting feud that, thankfully, ended before John’s death in 1980.
Source: doyouremember.com