EMI had planned to release an album of alternate takes and previously unreleased songs by the Beatles in 1985 called "Sessions", but the Beatles objected after it had been compiled; by the end of the year, bootleg copies were widely available. During the cataloguing and review of the EMI archives in the early 1980s in preparation for the "Sessions" album and a multimedia show given at Abbey Road Studios, it is suspected that high quality copies of some of the material were surreptitiously made. This may have been the source for the "Ultra Rare Trax" CD series from Swingin' Pig that started appearing in 1988, which provided takes never previously bootlegged in clarity that rivalled official releases.