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Gregorian is a German band headed by Frank Peterson that performs gregorian chant-inspired versions of modern pop and rock songs. The band features both vocal harmony and instrumental accompaniment. Originally, Gregorian was conceived as a more pop-oriented group in the vein of Enigma. Under this concept, they recorded the 1991 album Sadisfaction, with lead vocals provided by The Sisters of Oz: Susana Espelleta (Peterson's wife at the time) and Birgit Freud. However, this was the only album in that style. (Last.fm)