Hip-hop journalist Chang looks back on 30 years of the cultural landscape, with a particular focus on the African-American street scene, in this engaging and extensive debut. Chang shows how hip-hop arose in the rubble of the Bronx in the 1970s, when youth unemployment hit 60%-80%; traces the music through the black-Jewish racial conflicts of 1980s New York to the West Coast scene and the L.A. riots; and