Sgt. Pepper's Lonely Hearts Club Band "Being for the Benefit of Mr. Kite!" and "A Day in the Life". Producer George Martin and engineer Geoff Emerick helped realise the group's ideas by approaching the studio as an instrument, applying orchestral overdubs, sound effects and other methods of tape manipulation. Recording was completed on 21 April 1967. The cover, depicting the Beatles posing in front of a tableau of celebrities and historical figures, was designed by the British pop artists Peter Blake and Jann Haworth. "Sgt. Pepper" is regarded by musicologists as an early concept album that advanced the use of extended form in popular music while
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",