Listen Up! is the world's first publication to take a look at American radio art as a distinct sound art practice. Analytical essays by leading media art historians and practitioners discuss how the field took shape in the context of changing broadcast environments and socio-political realities, while manifestos and other original documents provide vivid glimpses into the concerns of artists seeking to insert their alternative visions into the mass medium radio. The volume also elucidates the role of prominent artists who worked extensively for European broadcasters and considers the difference between sound works for broadcast radio and their internet incarnations.