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 both began to cover rock music for the first time, with the latter changing its name to "Jazz & Pop" as a result. In addition, following "Sgt. Pepper", established American publications such as "Vogue", "Playboy" and the "San Francisco Chronicle" started discussing rock as art, in terms usually reserved for jazz criticism. Writing for "Rolling Stone" in 1969, Michael Lydon said that reviewers had had to invent "new criticism" to match pop's musical advances, since: "Writing had to be an appropriate response to the music; in writing about, say, "Sgt. Pepper", you had to try to write something as good