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
Art pop work of Warhol and artist Roy Lichtenstein, citing his ability to elevate common or hackneyed material to the level of "high art". In a move that was indicated by the Beatles, the Beach Boys, Phil Spector, and Frank Zappa, the dominant format of pop music transitioned from singles to albums, and many rock bands created works that aspired to make grand artistic statements, where art rock would flourish. Musicologist Ian Inglis writes that the cover art for the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band" was "perceived as largely responsible for the connections between art and pop to