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
Cultural impact of the Beatles in avant-garde composers such as Karlheinz Stockhausen and John Cage, similarly informed the recording of "Strawberry Fields Forever" and "Sgt. Pepper". Quoting a composer from the UCLA School of Music, "Time" magazine's appreciation of "Sgt. Pepper" recognised the Beatles as having adopted concepts first pioneered by the Cologne group, thereby making an "enormous contribution to electronic music". The Beatles were the first entertainment act to stage a large stadium concert. At Shea Stadium in New York City on Sunday, 15 August 1965, the group opened their 1965 North American tour to a record audience of 55,600. The event sold out