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
Experimental pop experimental pop groups. According to "The New York Times", Barrett and his subsequent solo albums "became a touchstone for experimental pop musicians". By the late 1960s, highly experimental pop music, or sounds that expanded the idea of the typical popular song, was positively received by young audiences, which cultural essayist Gerald Lyn Early credits to bands like Cream, Traffic, Blood, Sweat & Tears, and "of course", the Beatles. Drummer John Densmore believed that the Doors were on the cutting-edge of experimental pop music until he listened to the Beatles' album "Sgt. Pepper's Lonely Hearts Club Band" (1967), which he described