Emphasizing hands-on contact with the music—through playing, singing, listening, and analyzing—this book provides six chapters on theory, each illustrated with musical examples and fully worked-out analyses, all drawn largely from the “classical” pre-war repertoire by Schoenberg, Stravinsky, Bartok, Berg, and Webern. This book offers exceptionally clear, simple explanations of basic theoretical concepts for the post-tonal music of the twentieth century. Chapter topics include basic concepts and definitions; pitch-class sets; centricity, referential collections, and triadic post-tonality; basic twelve-tone operations; and more twelve-tone topics. Musicians and enthusiasts looking to explore advanced topics in music theory and analysis.