
The group toured extensively around the world until August 1966, when they performed their final commercial concert. They acquired the nickname the 'Fab Four' as Beatlemania grew in Britain over the following year, and by early 1964 they had become international stars, leading the 'British Invasion' of the United States pop market. They gained popularity in the United Kingdom after their first single, 'Love Me Do', became a modest hit in late 1962. They were moulded into a professional act by manager Brian Epstein, and their musical potential was enhanced by the creativity of producer George Martin. Sutcliffe left the group in 1961, and Best was replaced by Starr the following year. 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.
