For the past 40 years, pitch-class set theory has served as a frame of reference for the study of atonal music, through the efforts of Allan Forte, Milton Babbi

Describes and cites examples of pitch-class sets and relations in atonal music

Twentieth-Century Music Theory and Practice introduces a number of tools for analyzing a wide range of twentieth-century musical styles and genres. It includes

Portrays Schoenberg's atonal music as successions of motives and pitch-class sets that flesh out 'musical idea' and 'basic image' frameworks.

Understanding Post-Tonal Music is a student-centered textbook that explores the compositional and musical processes of twentieth-century post-tonal music. Inten