Black on Both Sides is the debut album of American rapper Mos Def, now known as Yasiin Bey, released October 12, 1999 on Rawkus Records. Prior to the album's recording, Mos Def had collaborated with rapper Talib Kweli for the duo's studio album, Mos Def & Talib Kweli Are Black Star (1998), which raised high expectations for a solo effort. Black on Both Sides features an emphasis on live instrumentation and socially conscious lyrics. On February 2, 2000, the album was certified Gold in sales by the Recording Industry Association of America (RIAA), following sales in excess of 500,000 copies.