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 the Beatles' "Rubber Soul" album. McCartney said he was highly impressed with the songs' "harmonic structures" and the choice of instruments used in Wilson's musical arrangements, and that these elements encouraged him to think the Beatles could "get further out" than the Beach Boys had. He added: "we were inspired by it and nicked a few ideas." According to author Kenneth Womack, the Beach Boys' subsequent release, the "Good Vibrations" single, was viewed by the Beatles and Martin as "a direct challenge" to their supremacy. McCartney identified "Pet Sounds" as his main musical inspiration for "Sgt. Pepper", although he said