Iconoclastic, enigmatic and angst-ridden are words used to describe former front man for the punk/thrash metal group Bad Brains, H.R. (Ras Hailu Gabriel Joseph I). A devout Rastafarian, H.R.'s songs, a seamless blend of singing, rap and African chanting, demand social and economic equality and an end to oppression and racism. He got his start with the Washington, D.C.-based Bad Brains, and sang with them through the '80s. H.R. periodically left to pursue his own career, returning only to make a few quick bucks. He infused their music with his own brand of reggae rhythms, which...