Between the official "Anthology" releases and the numerous outtakes that have been bootlegged, many of the Beatles' most interesting studio recordings are available in some form. Nevertheless, there are still recordings known to be in EMI's archives that have generated particular interest in their eventual release. One is "Carnival of Light", an improvised 14-minute vocal and sound collage that the Beatles created in early 1967 for an art festival; the recording was under consideration for "Anthology", and McCartney has been an advocate for its release. Another is take 3 of "Helter Skelter" from 18 July 1968, renowned for its length of twenty-seven minutes. "Anthology 3" included only a 4:38 edit of the 12:35 take 2 from that day's work on the song; asked why a longer version wasn't issued, George Martin explained: "I think it gets boring." The full 12 minutes of take 2 were eventually released in 2018 for the 50th anniversary of "The Beatles".