The essays in this collection reflect the range and depth of musical life in the United States during the first half of the twentieth century. Contributions consider the rise and triumph of popular forms such as jazz, swing, and blues, as well as the contributions to art music of composers such as Ives, Cage, and Copland, among others. American contributions to music technology and dissemination, and the role of these forms in extending the audience for music, is also a focus.