Music critic and historian Ted Gioia joins City Journal editor Brian Anderson to discuss the 4,000-year history of music as a global source of power, change, and upheaval—topics explored in his new book, Music: A Subversive History.

The music business is a $10 billion industry today. But according to Gioia, innovative songs have always come from outsiders—the poor, the unruly, and the marginalized. The culmination of his decades of writing about music, Gioia's new book is a celebration of the social outcasts who continue to define this art form.