From his own adolescence when his allegiance was to punk rock to his work as one of the essential voices of our time on music and culture at the New York Times and the New Yorker Kelefa Sanneh has made a deep study of how our popular music unites and divides us. Distilling a career's worth of knowledge Sanneh explores the tribes music forms and how its genres shape-shifting across the years give us a way to track larger forces and concerns.He debunks cherished myths reappraises beloved heroes an