The 1970s saw the first Beatle bootlegs issued on vinyl records. The first Beatles bootleg was "Kum Back", issued around January 1970 in a plain white sleeve with plain white labels and no mention of a record company. This vinyl bootleg was based on an acetate of one of the early rough mixes by Glyn Johns of the "Get Back" album (which would later become "Let It Be"). John Lennon may have been the unintentional source for one of the "Get Back" bootlegs; Lennon said: "They say it came from an acetate that I gave to someone who then went and broadcast it as being an advance pressing or something."