Nine' is the first track on Madhouse's second and final album 16. Nine was written and performed by Prince (credited as Madhouse), with saxophone by Eric Leeds.
While specific recording dates are not known, basic tracking took place in March 1987, at Prince's Galpin Blvd Home Studio in Chanhassen, Minnesota (during the same set of sessions as Cindy C. and Dead On It). The rest of the album was recorded in late July and early August 1987; it is likely that the title was assigned only after the final sequence had been arranged for the album.
The track contains interpolations of Euphemia Allen's 1877 piano composition Chopsticks and Richard Rodgers' and Oscar Hammerstein II's 1959 composition The Sound Of Music (originally from the stage musical The Sound Of Music, as well as opening with synths previously used on U Got The Look.
Although sharing a name and both being attributed to Madhouse, the track is different to the track Nine, an unreleased track recorded during the 8 sessions in October 1986 (see Nine for details).