The singer who contributed vocals to the track "You Know What It Is" was a member of what hip hop group?
You Know What It Is: "You Know What It Is" is a song by American hip hop recording artist T.I., released July 10, 2007, as the second single from his fifth studio album "T.I. vs. T.I.P." (2007). You Know What It Is:  The song was produced by Jerry "Wonda" Duplessis and Wyclef Jean, the latter of whom contributes vocals throughout the track.
i don't know