Rubber Soul is the sixth studio album by the English rock band the Beatles. It was released on 3 December 1965 in the United Kingdom on EMI's Parlophone label, accompanied by the non-album double A-side single "Day Tripper" / "We Can Work It Out". The original North American release, issued by Capitol Records, contains ten of the fourteen songs and two tracks withheld from the band's Help! album. Rubber Soul was described as an important artistic achievement by the band, meeting a highly favourable critical response and topping sales charts in Britain and the United States for several weeks.

Sgt. Pepper's Lonely Hearts Club Band is the eighth studio album by the English rock band the Beatles. Released on 26 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.