One is the first track on Madhouse’s first album 8. One was written and produced by Prince (credited only to Madhouse), with saxophone and musical input by Eric Leeds. No musician is credited on the record.
Basic tracking took place on 28 September 1986 at Prince’s Galpin Blvd Home Studio in Chanhassen, Minnesota (recorded in sequence between Baby Doll House and Two, the day before Three, Four and Five), although it is credited as being recorded at "Madhouse Studios", Pittsburgh, PA, USA (a fictional studio). It is likely that the title was assigned only after the final sequence had been arranged for the album.