On 30 January 1969, Glyn Johns compiled some performances he had been mixing, and made acetate copies for the Beatles. In addition to songs that would eventually appear on "Let It Be", this set included "Teddy Boy", "The Walk", by Jimmy McCracklin, and a rock and roll medley that included songs such as "I'm Ready", an early Fats Domino song, and "Shake Rattle and Roll", by Big Joe Turner. This was the first version that leaked out and broadcast on multiple radio stations starting in September 1969, and formed the basis for the bootleg "Kum Back" that appeared near the end of 1969. Johns started working in earnest on compiling an album in March 1969, and a test acetate from this period eventually surfaced on a poor quality bootleg.