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,
Experimental pop as "[seeming] to have done it all". Martin wrote that, along with the Rolling Stones' "Their Satanic Majesties Request" (1967), the Beatles' "Sgt. Pepper" "opened a space" for experimental pop which would be later filled by Jimi Hendrix, Jethro Tull, and the Who's "Tommy" (1968). Prior to "Sgt. Pepper", Gary Usher and Curt Boettcher were Los Angeles-based songwriters and producers who were interested in classical music and the avant-garde. Later cited as fixtures of sunshine pop, they worked together to create their debut studio album, "Present Tense" (1968). It was credited to Sagittarius, a studio group referred to as an