Promise To Be True (also known as Promise 2 Be True) is a song recorded on 30 April 1983 at Prince’s Kiowa Trail Home Studio in Chanhassen, Minnesota, the same day as basic tracking for Sex Shooter. It was initially intended for Vanity 6’s planned second album, although it is unclear if Vanity ever recorded vocals for it. Dez Dickerson worked on it in May 1983, but when Vanity decided in August not to participate in the Purple Rain movie, the song was shelved for the time being.
The track was re-recorded on 25 January 1987, at Prince’s Galpin Blvd Home Studio,Chanhassen, MN, USA, for use by American blues singer-songwriter Bonnie Raitt, during a short-lived planned collaboration between the two artists, where Prince offered four songs to her (I Need A Man, Jealous Girl, Promise To Be True and There’s Something I Like About Being Your Fool).
Prince’s version of the song was released in 2020 as the seventh track of Vault Tracks part 3, one of the discs with previously unreleased tracks included with the Sign O’ The Times Super Deluxe Edition.