by Jason Ankeny\r From his early work with the pioneering Krautrock band Cluster to his later, more ambient solo recordings, Hans Joachim Roedelius remained one of the most innovative and prolific voices in contemporary electronic music. Born in Berlin in 1934, he drifted through a series of odd jobs before turning to music, later collaborating with conceptual artist Conrad Schnitzler in a series of experimental bands including Plus/Minus, Noises and the Human Being. In 1968, Roedelius and Schnitzler were among the co-founders of the Zodiak Free Arts Lab, a group of avant-garde artists from a variety of creative disciplines which quickly became one of the driving forces of the Berlin underground scene; with Dieter Moebius, they formed Kluster in 1969, performing extended improvisational live dates throughout West Germany. \r \r Cluster released their debut LP Klopfzeichen in 1970; in the wake of their third album, 1971s Kluster und Er...