The Radio Revolten festival is casting its shadow in sound: this weekend Radio Corax will feature the international radio art festival Radio Revolten. 38 hours of programming give a taste of what might happen upon us in October in Halle and across the ether. We will introduce and contact some of the nearly hundred invited artists, showcase radio art from the international Radia network, figure out what wine, chocolate and radio art have in common, question the oracle of the Hausmann towers and investigate radio for flowers in the botanical garden. And we might touch on the mother of all questions: What is it exactly, this radio art?