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
Sgt. Pepper's Lonely Hearts Club Band A-side single and not included on the album. In February 1967, after recording the title track "Sgt. Pepper's Lonely Hearts Club Band", McCartney suggested that the Beatles should release an entire album representing a performance by the fictional Sgt. Pepper band. This alter ego group would give them the freedom to experiment musically. During the recording sessions, the band furthered the technological progression they had made with their 1966 album "Revolver". Knowing they would not have to perform the tracks live, they adopted an experimental approach to composition and recording on songs such as "Lucy in the Sky with Diamonds",