 It was the first official release by the Beatles of previously unreleased performances since "The Beatles at the Hollywood Bowl" in 1977 and the first containing previously unreleased songs since their final studio album, "Let It Be", in 1970.Although the songs were recorded ahead of broadcast, allowing for retakes and occasional overdubbing, they are essentially "live in studio" performances.Most of the songs are cover versions of material from the late 1950s and early 1960s, reflecting the stage set they developed before Beatlemania.