BlackStar is an American hip hop duo formed in 1997, from Brooklyn, New York City, New York. The duo is composed of rappers Yasiin Bey (Mos Def) and Talib Kweli. They released a number of singles and one album, Mos Def & Talib Kweli Are Black Star on August 26, 1998. The record received critical acclaim, but only moderate commercial success. Since then the duo has worked together intermittently on soundtracks and other projects.