After the Beatles' EMI contract expired in 1976, the company began assessing the band's unreleased material for a future release. The first batch of songs to leak came from an in-house compilation cassette that contained "Leave My Kitten Alone", "One After 909" (from 1963), "If You've Got Trouble", "Christmas Time (Is Here Again)", "That Means a Lot", "Come and Get It", "Dig a Pony" (unedited version), and two medleys from the "Get Back" / "Let It Be" sessions: "Rip It Up / Shake, Rattle and Roll" and "Not Fade Away / Bo Diddley". In 1981, in-house engineer John Barrett was given the task of cataloguing the complete collection of tapes from the band's seven-year career with EMI. This led to two projects: a public audio-visual presentation at Abbey Road Studios called "The Beatles Live at Abbey Road" (which opened on 18 July 1983) and a planned outtakes album which was to be called "Sessions". In addition to some of the songs included on the previously leaked compilation tape, "Sessions" added "Not Guilty", "What's the New Mary Jane", "How Do You Do It?", "Bésame Mucho", "Mailman, Bring Me No More Blues", "While My Guitar Gently Weeps" (demo), and early takes of "Ob-La-Di, Ob-La-Da" and "I'm Looking Through You". Shortly before the album's scheduled 1985 release, it was vetoed by the surviving members of the band; but both audience recordings of the Abbey Road presentation and the leaked promos of "Sessions" became available to bootleggers. These songs appeared on bootleg series such as "Ultra-Rare Trax" and "Unsurpassed Masters", along with other material presumably copied while preparing these projects. Most of the aforementioned tracks were officially released on the "Anthology" albums in 1995 and 1996. New Beatles studio outtakes continue to occasionally appear; in February 2009, a complete 10:46 recording of “Revolution 1 (Take 20)” from the White Album sessions was released on the bootleg "Revolution: Take... Your Knickers Off!". This version begins with Lennon jokingly counting that way. Many of the Beatles' concert performances have appeared on bootleg albums. The earliest relatively complete concert recording is from the 7 December 1963 show at the Liverpool Empire Theatre.