Gino Vannelli says: "Wonderful Ass" is an unreleased track recorded in early 1983 at Prince's Kiowa Trail Home Studio, Chanhassen, MN. The track is a pop-funk track with synth lead lines, a drum machine beat and rhythm guitar. The track's lyrics were supposedly inspired by Vanity... Lisa Coleman and Wendy Melvoin worked on the track further in early 1986, most likely at Sunset Sound, Hollywood, CA, adding vocals and other instrumentation…It is not known if this song was intended for any project at the time of additional recording. The song remains unreleased.
EDIT: SONG REMOVED. SORRY.
[Via OKP ]