Order and Disorder is the result of the first International Orpheus Academy for Music Theory, held in 2003. Its theme was 20th century music and theory, especially after the 1950s. Five guest lecturers discussed theoretical, historical and philosophical aspects of this theme in six articles. In "Music-Analytical Trends of the Twentieth Century," Jonathan Dunsby discusses key features in the development of music analysis from prestructuralist to postmodern...