Following the astounding four-decade run of Hans-Joachim Roedelius and Dieter Moebius' pioneering Krautrock duo Cluster -- whose history extends back to the late '60s as Kluster, its initial lineup with Conrad Schnitzler -- Roedelius swapped a letter as well as a bandmember in the early 2010s, forming Qluster with musician and sound installation artist Onnen Bock of Zeitkratzer, whom he had started working with in 2007. The new incarnation continued in the creative spirit of its predecessors, based on spontaneous improvisations using analog synthesizers as well as Roedelius' s...