SLIPKNOT Slipknot (Rare Withdrawn 1999 Japanese 19-track CD, the debut studio album by the American heavy metal group. This was withdrawn due to allegations of copyright infringement of the songs Purity and Frail Limb Nursery, these were inspired by a story that was published on the internet about a girl named Purity Knight, who was kidnapped and buried alive, also including four bonus recordings; complete with a fold-out lyric printed picture sleeve with a fold-out Japanese insert and obi-strip RRCY-1106)