Paul McCartney February 1967, and the LP followed in June. McCartney's "She's Leaving Home" was an orchestral pop song. MacDonald described the track as "[among] the finest work on "Sgt. Pepper"—imperishable popular art of its time". Based on an ink drawing by McCartney, the LP's cover included a collage designed by pop artists Peter Blake and Jann Haworth, featuring the Beatles in costume as the Sgt. Pepper's Lonely Hearts Club Band, standing with a host of celebrities. The heavy moustaches worn by the Beatles reflected the growing influence of hippie style trends on the band, while their clothing "spoofed the vogue in
Cultural impact of the Beatles as, in author Shawn Levy's description, "the world's first household psychedelics, avatars of something wilder and more revolutionary than anything pop culture had ever delivered before". Author Carys Wyn Jones locates "Sgt. Pepper's", along with "Pet Sounds", to the beginning of art rock. Both albums are largely viewed as beginnings in the progressive rock genre due to their lyrical unity, extended structure, complexity, eclecticism, experimentalism and influences derived from classical music forms. For several years following "Sgt. Pepper" release, straightforward rock and roll was supplanted by a growing interest in extended form. Several of the English psychedelic bands who followed