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,
Album era "A Christmas Gift for You from Phil Spector" (1963), the Beatles' "Rubber Soul" (1965), the Beach Boys' "Pet Sounds" (1966), the Mothers of Invention's "Freak Out!" (1966), and the Beatles' "Sgt. Pepper's Lonely Hearts Club Band" (1967). In reference to the Beatles' "Rubber Soul", "Revolver" (1966) and "Sgt. Pepper" and the Beach Boys' "Pet Sounds", writer Bill Martin noted: "In the wake of these albums, many rock musicians took up the 'complete album approach.'" "Rolling Stone" assistant editor Andy Greene felt that "Sgt. Pepper's" "was the beginning of the album era. It was the big bang of albums." According to