Book excerpt: Ton de Leeuw was a truly groundbreaking composer. As evidenced by his pioneering study of compositional methods that melded Eastern traditional music with Western musical theory, he had a profound understanding of the complex and often divisive history of twentieth-century music. Now his renowned chronicle Music of the Twentieth Century is offered here in a newly revised English-language edition. Music of the Twentieth Century goes beyond a historical survey with its lucid and impassioned discussion of the elements, structures, compositional principles, and terminologies of twentieth-century music. De Leeuw draws on his experience as a composer, teacher, and music scholar of non-European music traditions, including Indian, Indonesian, and Japanese music, to examine how musical innovations that developed during the twentieth century transformed musical theory, composition, and scholarly thought around the globe.