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
Album cover quickly becoming a collector's item. The move to the small (less than 1/4 the size of a record) CD format lost that impact, although attempts have been made to create a more desirable packaging for the CD format, for example the reissue of "Sgt. Pepper", which had a cardboard box and booklet, or the use of oversized packaging. The importance of design was such that some cover artists specialised or gained fame through their work. Such people include the design team Hipgnosis, through their work on Pink Floyd albums, amongst others; Roger Dean, famous for his Yes and Greenslade covers;