Hans Flesch, founding director of the Frankfurt Radio and later director of the Berlin Radio, noted in 1930 that for broadcasting, the "wonderful synthesis of technology and art in the process of transmission," the saying applies: "In the beginning was the experiment." As practitioners and theorists of Weimar Radio (1923-33), Hans Flesch, a friend of Paul Hindemith, and Ernst Schoen, program director of Frankfurt Radio and close confidant of Walter Benjamin, explored the new medium. In dialogue with the contemporary avant-garde and figures such as Ferruccio Busoni, Arnold Schönberg, Kurt Weill, Bertolt Brecht, and others, they experimented with aesthetic and socio-political media concepts and programming practices. This study presents the first comprehensive appreciation of the work of Hans Flesch and Ernst Schoen while simultaneously re-examining Weimar Radio.