John Koukouzelis

John Koukouzelis or Jan Kukuzeli (Albanian: (Shën) Jan Kukuzeli; Bulgarian: Йоан Кукузел, Yoan Kukuzel; Greek: Ιωάννης Κουκουζέλης, Ioannis Koukouzelis; c. 1280 – c. 1360) was an Albanian-Bulgarian medieval Orthodox Christian composer, singer and reformer of Orthodox Church music. Koukouzelis received his education at the Constantinople court vocal school and established himself as one of the leading authorities in his field during the time.