The Klangwolke [Cloud of Sound] is an autumn highlight of Linz’s annual calendar of events. Conceived as a blend of music, performance, art and spectacle with a different theme each year, it’s been a crowd-pleaser ever since its launch in 1979. The 2016 edition is entitled “River of Knowledge.” We recently had a chance to talk about the upcoming event with producer Uwe Buhrdorf and Rica Blunck and Tilo Nest of the cast and crew.