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Released on "The Beatles", the eight-minute "Revolution 9" was an overt exercise in electronic music and the avant-garde. MacDonald identifies the track as another example of the Beatles introducing a previously elite scene to a mainstream audience and describes it as "the world's most widely distributed avant-garde artifact". In early 1969, Harrison became one of the first musicians in the UK to own a Moog synthesizer, which the Beatles went on to use on "Abbey Road" tracks such as "Here Comes the Sun" and "I Want You (She's So Heavy)". Writing in his book on electronic music, author Thom Holmes says that in this way the Beatles were "one of the first groups to effectively integrate the sounds of the Moog into their music".