Sgt. Pepper's Lonely Hearts Club Band

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 , Paul McCartney , George Harrison and Ringo Starr . 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 and Pete Best , 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.
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Rock music is a genre of popular music that developed during and after the 1960s, particularly in the United Kingdom and the United States. It has... its roots in 1940s and 1950s rock and roll, itself heavily influenced by rhythm and blues and country music. Rock music also drew strongly on a number of other genres such as blues and folk, and incorporated influences from jazz, classical and other musical sources. Musically, rock has centered around the electric guitar, usually as part of a rock group with bass guitar and drums. Typically, rock is song-based music usually with a 4/4 time signature utilizing a verse-chorus form, but the genre has become extremely diverse and common musical characteristics are difficult to define. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political in emphasis. The dominance of rock by white, male musicians has been seen as one of the key factors shaping the themes explored in rock music. Rock places a higher degree of emphasis on musicianship, live performance, and an ideology of authenticity than pop music.
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