The Beatles' bootleg recordings (also known as Beatlegs[citation needed]) are recordings of performances by the Beatles that have attained some level of public circulation without being available as a legal release. The term most often refers to audio recordings, but also includes video performances. Starting with vinyl releases in the 1970s, through CD issues in the late 1980s, and continuing with digital downloads starting in the mid 1990s, the Beatles have been, and continue to be, among the most bootlegged artists.
Bootleg recordings arise from a multitude of sources, including radio and TV broadcast performances, live shows, studio outtakes and session tapes, alternate mixes, test discs, and home demos. The largest single source of Beatles bootleg material is the set of Nagra audio tapes from the 1969 filming of the Get Back / Let It Be rehearsal and recording sessions.