Sgt. Pepper's Lonely Hearts Club Band album carried on the childhood and Liverpool theme with its circus and fairground effects, its pervading atmosphere of the traditional northern music hall that was in both its main creators' [McCartney and Lennon's] blood." "Sgt. Pepper" album cover was designed by the pop artists Peter Blake and Jann Haworth. Blake recalled of the concept: "I offered the idea that if they had just played a concert in the park, the cover could be a photograph of the group just after the concert with the crowd who had just watched the concert, watching them. If we did this by using cardboard
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