The discography of Yasiin Bey / Mos Def, an American rapper, consists of four solo albums, two compilation albums, and several singles. Mos Def began his hip hop career in 1994 in the underground rap group UTD (Urban Thermo Dynamics) alongside his sibling group members DCQ and Ces, after which he pursued a solo career. In 1998, he made his mainstream debut on Rawkus Records in the duo Black Star with rapper Talib Kweli. "Definition", the lead single from Black Star's self-titled debut album, reached No. 60 on the Billboard Hot 100 and No. 3 on the Hot Rap Singles chart.