Black On Both Sides is the debut studio album by American rapper Mos Def, released in 1999. The album features singles such as 'Ms. Fat Booty/Mathematics' and 'Umi Says'. Black on Both Sides is known for its socially conscious lyrics and high-quality production from well-known producers such as DJ Premier, Ali Shaheed Muhammad, and 88-Keys. The album went gold in February 2000, selling over 500,000 copies. The page also includes a tracklist and a list of the album's contributors.