Yasiin Bey, fka Mos Def, performing “Umi Says” live at New York City’s Bowery Ballroom in July 2001. From 1997 to 2001, HBO’s ‘Reverb’ series highlighted emerging talent with a special performance and exclusive backstage views. This performance showcases Mos Def’s supergroup Black Jack Johnson featuring Bad Brain’s guitarist Dr. Know, Living Colour’s bassist Doug Wimbish and drummer Will Calhoun, and founding member of Parliament-Funkadelic, keyboardist Bernie Worrell. 📹: redacted2275 on YouTube #MosDef #YasiinBey #newyorkcity #liveperformance