The Beatles were an English rock band formed in Liverpool in 1960 and one of the most commercially successful and critically acclaimed acts in the history of popular music. The group's best-known lineup consisted of John Lennon (rhythm guitar, vocals), Paul McCartney (bass guitar, vocals), George Harrison (lead guitar, vocals) and Ringo Starr (drums, vocals). Rooted in skiffle and 1950s rock and roll, the group later worked in many genres ranging from pop ballads to psychedelic rock, often incorporating classical and other elements in innovative ways. Their enormous popularity first emerged as "Beatlemania"; as their songwriting grew in sophistication, by the late 1960s they came to be perceived by many fans and cultural observers as an embodiment of the ideals shared by the era's sociocultural revolutions.
As a five-piece line-up of Lennon, McCartney and Harrison on guitar and vocals, with Stuart Sutcliffe (bass) and Pete Best (drums), the band built their reputation playing clubs in Liverpool and Hamburg over a three-year period from 1960. Sutcliffe left the group in 1961, and Best was replaced by Starr the following year. Moulded into a professional act by manager Brian Epstein, their musical potential was enhanced by the creativity of producer George Martin. They gained popularity in the United Kingdom after their first single, "Love Me Do", became a modest hit in late 1962, and they acquired the nickname the "Fab Four" as Beatlemania grew in Britain over the following year. By early 1964 they had become international stars, leading the "British Invasion" of the United States pop market. The band toured extensively around the world until August 1966, when they performed their final commercial concert. From 1966 they produced what many critics consider to be some of their finest material, including the innovative and widely influential albums Revolver (1966), Sgt. Pepper's Lonely Hearts Club Band (1967), The Beatles (1968) and Abbey Road (1969). After their...
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