In this exciting new study of a largely overlooked but nevertheless extremely important figure in American music, author Allen Cohen explores the relationship between theory and practice in the works of Howard Hanson, a prominent twentieth-century composer, conductor, and educator. In Hanson's book "Harmonic Materials of Modern Music," he proffered a theory of classification of all possible pitch-class collections in the chromatic scale, showing ways of deriving larger collections from smaller ones, and demonstrating significant relationships among them. This theory anticipated in many...