Listen Up! is the first publication worldwide to take an in-depth look at the development of Radio Art in the United States as a distinct sound art practice. Analytical essays by leading media art historians and practitioners discuss the ways in which a new field took shape in the context of changing broadcast environments and sociopolitical realities from the 1960s through the 1990s. The essays provide engaging reading for scholars, radio producers, and artists, as well as radio enthusiasts and lay audiences. Also included are manifestos and other texts written by Terry Allen, Jacki Apple, John Cage, Don Joyce / Negativland, Max Neuhaus, Pauline Oliveros, Helen Thorington, and others. The material vividly reflects the zeitgeist of the period and proposes trajectories for new research into fascinating yet still largely unexplored territories.