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
Sgt. Pepper's Lonely Hearts Club Band that point." Harrison added that, having enjoyed recording "Rubber Soul" and "Revolver", he disliked how the group's approach on "Sgt. Pepper" became "an assembly process" whereby, "A lot of the time it ended up with just Paul playing the piano and Ringo keeping the tempo, and we weren't allowed to play as a band as much." After finishing "Sgt. Pepper", the Beatles took an acetate disc of the album to the American singer Cass Elliot's flat off King's Road in Chelsea, where at six in the morning they played it at full volume with speakers set in open window frames.