Collegium Vocale Köln
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Collegium Vocale Köln is a German vocal ensemble, founded in the late 1960s when its members were still students at the Rheinische Musikschule in Cologne. It is directed by Wolfgang Fromme, who also sings tenor in the ensemble. They are best-known as the group for which Karlheinz Stockhausen composed Stimmung in 1968, a work which they have performed hundreds of times throughout the world.