The Beatles (album) stereo only. In the UK, the following album, "Yellow Submarine", was the last to be shipped in mono. The mono version of "The Beatles" was made available worldwide on 9 September 2009, as part of "The Beatles in Mono" CD boxed set. A reissue of the original mono LP was released worldwide in September 2014. The album's sleeve was designed by pop artist Richard Hamilton, in collaboration with McCartney. Hamilton's design was in stark contrast to Peter Blake's vivid cover art for "Sgt. Pepper's Lonely Hearts Club Band", and consisted of a plain white sleeve. The band's name, in Helvetica,
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",