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
Progressive pop Beatles and the Yardbirds. In December 1966, "Melody Maker" attempted to define the recent developments in pop. In this article, titled "Progressive Pop", Chris Welch categorised artists using terms previously associated with jazz; in the most advanced of these, "Avant-Garde", he placed the Beatles, Cream, Love, the Mothers of Invention, Pink Floyd and Soft Machine, while "Modern", the next category, comprised the Byrds, Donovan and the Small Faces. After the release of the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band", magazines such as "Melody Maker" drew a sharp line between "pop" and "rock', thus eliminating the "roll" from