Original sentence: Bootleg records of the group began showing up in the late 1960s.In the 1980s, compact discs and videos began to replace records as prevalent forms of bootleg material.The Beatles are one of the most bootlegged acts in music history.The Beatles bootlegs are audio and/or video recordings of musical performances by English rock band The Beatles which were not officially released by the band, or under other legal authority.These bootlegs contained unreleased material that was illegally recorded, stolen or leaked from the band's record label EMI
Edited sentence: Bootleg recordings arise from a multitude of sources, including broadcast performances, recordings of live shows, test discs, privately distributed copies of demos, and covertly copied studio session tapes.From the earliest Beatles bootlegs in the late 1960s, the group has been one the most bootlegged rock artists.Performances for the BBC, stage and concert recordings, and studio outtakes have also been extensive sources for Beatles bootlegs.The Beatles bootleg recordings are performances by The Beatles that have attained some level of public circulation without being available as a legal release.The largest single source of Beatles bootleg material is the set of Nagra audio tapes from the 1969 filming of the Get Back rehearsal and recording sessions.The term most often refers to audio recordings, but also includes video performances