Apropos Cluster is a full-length studio album by Dieter Moebius and Hans-Joachim Roedelius also known as German electronic music outfit Cluster. It was also their first album after an eight-year-long hiatus.In 1989 Dieter Moebius and Hans-Joachim Roedelius reunited to the delight of their fans, recording Apropos Cluster during 1989 and 1990 in Blumau, Austria. The album was released on the Curious Music label in 1991. It was "Cluster"'s first U.S. release.