How do artists, composers, performers, curators, technicians and scientists interact with acousmatic sound and music in the institutional and technological context of German radio. What kind of practices of performing, composing, listening and curating did evolve? What epistemologies and aesthetics did this give rise to? We especially study the use of radiophonic sound in creating and presenting knowledge about working class, colonial, leftist and subaltern realities and histories joining approaches from sound and cultural studies with a musicological attentiveness to the historical layers and dramaturgy of sound and music.