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 as largely responsible for the connections between art and pop to be made explicit." Riley describes the cover as "one of the best-known works that pop art ever produced", while Norman calls it "the most famous album cover of all time". In the late 1990s, the BBC included the "Sgt. Pepper" cover in its list of British masterpieces of twentieth-century art and design, placing it ahead of the red telephone box, Mary Quant's miniskirt, and the Mini motorcar. In 2008, the bass drum skin used on the front cover sold at auction for €670,000. "Sgt. Pepper" sustained its immense popularity