Twentieth-Century Music An Introduction Author:Eric Salzman This is the first book in the Prentice-Hall's "History of Music Series" This book has five sections. Part 1: Twentieth Century Music and the Past. Part 11: The Breakdown of Traditional Tonality, Part 111: The New Tonalities. Part 1V: Atonality and Twelve-tone Music. Part V: The Avant-Garde.