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, the tribes it forms, and how its genres, shape-shifting across the years, give us a way to track larger forces and concerns. Sanneh debunks cherished myths, reappraises beloved heroes, and upends familiar ideas of musical greatness, arguing that sometimes, the best popular music isn't transcendent: it expresses our grudges, as well as our hopes, and it is motivated by greed as well as inspiration.