Sgt. Pepper's Lonely Hearts Club Band (often referred to simply as Sgt. Pepper) is the eighth studio album by the English rock band the Beatles. Released on 26Â May 1967, Sgt. Pepper is regarded by musicologists as an early concept album that advanced the roles of sound composition, extended form, psychedelic imagery, record sleeves, and the producer in popular music. The album had an immediate cross-generational impact and was associated with numerous touchstones of the era's youth culture, such as fashion, drugs, mysticism, and a sense of optimism and empowerment. Critics lauded the album for its innovations in songwriting, production and graphic design, for bridging a cultural divide between popular music and high art, and for reflecting the interests of contemporary youth and the counterculture.
At the end of August 1966, the Beatles had permanently retired from touring and pursued individual interests for the next three months. During a return flight to London in November, Paul McCartney had an idea for a song involving an Edwardian military band, forming the impetus of the Sgt. Pepper concept. For this project, they continued the technological experimentation marked by their previous album, Revolver (1966), this time without an absolute deadline for completion. Sessions began on 24Â November at EMI Studios with compositions inspired by the Beatles' youth, but after pressure from EMI, the songs "Strawberry Fields Forever" and "Penny Lane" were released as a double A-side single in February 1967 and left off the LP. The album was then loosely conceptualised as a performance by the fictional Sgt. Pepper band, an idea that was conceived after recording the title track.