Given the nature of the 8-track format, the band decided to record a guitar solo that would connect the 2 halves of the song and explicitly bring the album back full circle. Floyd associate Snowy White was assigned the task after David Gilmour's take was accidentally erased, and the resulting "complete" version of "Pigs on the Wing" was included exclusively on British and American pressings of the 8-track tape when the album was released.
As time passed and the 8-track went extinct, though the Floyd remained as popular as ever well on through the beginning of the CD era, this solo slipped out of the discography as the catalog was standardized to reflect the more familiar tracklisting associated with the original LP. As time went by, Snowy White's solo took on mythic stature among the band's fanbase, particularly as reissues continued and it became the only commercially unavailable piece of music the band had ever officially released.