_THE DIFFERENTIATION OF MODERNISM_ ANALYZES THE PHENOMENON OF INTERMEDIALITY IN GERMAN RADIO PLAYS, FILM MUSIC, AND ELECTRONIC MUSIC OF THE LATE MODERNIST PERIOD (1945-1980). After 1945, the purist "medium specificity" of high modernism increasingly yielded to the mixed forms of intermediality. Theodor Adorno dubbed this development a "Verfransung," or "fraying of boundaries," between the arts. _TheDifferentiation of Modernism_ analyzes this phenomenon in German electronic media arts of the late modernist period (1945-80): in radio plays, film music, and electronic music. The first part of the book begins with a chapter on Adorno's theory of radio as an instrument of democratization, going on to analyze the relationship of the _Hörspiel_ or radio play to electronic music. In the second part, on film music, a chapter on Adorno and Eisler's _Composing for the Film_ sets the parameters for chapters on the film _Das Mädchen Rosemarie_ (1957) and on the music films of Jean-Marie Straub and Danièle Huillet. The third part examines the music of Karlheinz Stockhausen and its relationship to radio, abstract painting, recording technology, and theatrical happenings. The book's central notion of the "differentiation of culture" suggests that late modernism, unlike high modernism, accepted the contingency of modern mass-media driven society and sought to find new forms for it. Larson Powell is Associate Professor of German at the University of Missouri, Kansas City. He is the author of _The Technological Unconscious in German Modernist Literature_ (Camden House, 2008).