The Beatles ( B15 )

 Their hairstyle, unusually long for the era and mocked by many adults, became an emblem of rebellion to the burgeoning youth culture.

The group's popularity generated unprecedented interest in British music, and many other UK acts subsequently made their American debuts, successfully touring over the next three years in what was termed the British Invasion. The Beatles' success in the US opened the door for a successive string of British beat groups and pop acts such as the Dave Clark Five, the Animals, Petula Clark, the Kinks, and the Rolling Stones to achieve success in America. During the week of 4 April 1964, the Beatles held twelve positions on the Billboard Hot 100 singles chart, including the top five.

Capitol Records' lack of interest throughout 1963 did not go unnoticed, and a competitor, United Artists Records, encouraged its film division to offer the Beatles a three-motion-picture deal, primarily for the commercial potential of the soundtracks in the US. Directed by Richard Lester, A Hard Day's Night involved the band for six weeks in March–April 1964 as they played themselves in a musical comedy. The film premiered in London and New York in July and August, respectively, and was an international success, with some critics drawing a comparison with the Marx Brothers.

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