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Hans-Joachim Roedelius (born 26 October 1934) is a German electronic musician and composer, known as a co-founder of the influential 'kosmische' groups Cluster and Harmonia. He is notable for his prolific discography, either as a solo artist, as part of a band, or in collaboration with other artists. He has more than 100 releases to his name. He also performed in the ambient jazz trio Aquarello, and released several solo studio albums.