Sgt. Pepper's Lonely Hearts Club Band "Being for the Benefit of Mr. Kite!" and "A Day in the Life". Producer George Martin and engineer Geoff Emerick helped realise the group's ideas by approaching the studio as an instrument, applying orchestral overdubs, sound effects and other methods of tape manipulation. Recording was completed on 21 April 1967. The cover, depicting the Beatles posing in front of a tableau of celebrities and historical figures, was designed by the British pop artists Peter Blake and Jann Haworth. "Sgt. Pepper" is regarded by musicologists as an early concept album that advanced the use of extended form in popular music while
The Beatles the band's entourage are sometimes given the informal title of "fifth Beatle". As their enormous popularity grew into the frenzy dubbed "Beatlemania" in 1963, they acquired the nickname "the Fab Four", and by early 1964 became international stars, leading the "British Invasion" of the United States pop market. From 1965 onwards, the Beatles produced increasingly innovative recordings, including the albums "Rubber Soul" (1965), "Revolver" (1966), "Sgt. Pepper's Lonely Hearts Club Band" (1967), "The Beatles" (also known as the "White Album", 1968) and "Abbey Road" (1969). In 1968, they founded Apple Corps, a multi-armed multimedia corporation. After breaking up in 1970,