This work investigates the evolution of opera throughout the twentieth century, questioning how the medium transitioned from the dominance of nineteenth-century Wagnerian traditions to the diverse, fragmented landscape of modern music drama. Ethan Mordden, a noted chronicler of musical theater and opera, utilizes a historical framework to analyze how composers navigated the changing cultural and aesthetic demands of the era. He examines the shift in operatic structure, thematic focus, and the integration of modernist sensibilities into a traditionally conservative art form.

Critics and scholars recognize this text as a singular resource for English-language readers seeking a broad overview of the period. Readers frequently note the accessible prose style, which balances technical musical observation with historical narrative.