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John Lennon and Yoko Ono first met in 1966. Lennon was a world-famous member of the Beatles, and Ono was an avant-garde artist and performer. By 1968, the two established a romantic relationship and they began collaborating on a number of musical projects. They first recorded together in May 1968; these recordings would be released in November as the experimental album '. The pair also worked throughout the summer on "Revolution 9", an experimental piece that appeared on the Beatles' White Album. In December 1968, Lennon and Ono appeared together at The Rolling Stones Rock and Roll Circus with a supergroup named "The Dirty Mac", consisting of Eric Clapton, Keith Richards of the Rolling Stones, Mitch Mitchell of the Jimi Hendrix Experience, and violinist Ivry Gitlis. Lennon and Ono continued with their experimental releases parallel to Lennon's activities in the Beatles, releasing ' in May 1969.