Excerpted from "Rebel Music: Race, Empire, and the New Muslim Culture" One of the odder phenomena of the last decade is hearing national security elites, terrorism experts, and career diplomats discuss the finer points of “flow,” “bling,” and the “politics of cool.” American and European terrorism experts have increasingly expressed concerns over “anti-American hip-hop,” accenting the radicalizing influence of the genre. Noting that Al-Shabaab, the Somali-based Islamist group, uses “jihad rap” in its recruitment videos, Harvard scholar Jessica Stern wrote in Foreign Affairs: “The first- and second-generation Muslim children I interviewed for a study of the sources of radicalization in...