In advance of the much-anticipated Sign O' the Times boxed set, the Prince estate has dug up another gem from the late singer's vault.

The funky "I Need a Man" originates from 1981--he initially wrote it for a girl group that turned into Vanity 6--but Prince recorded this version in 1987 after he was possibly collaborating with Bonnie Raitt.

The tune is well worth the wait, as it features horns, sax and a super-funky bassline.

The Sign o' the Times box is due September 25.