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Gregorian Chant is a form of monophonic, unaccompanied sacred music that emerged in the early medieval Catholic Church and is characterized by its free-flowing melody and spiritual solemnity. The chant system was named after Pope Gregory I (590–604)
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During the Ars Antiqua (12th and 13th centuries moreless) the first plyphonic form was developed: the organum. It´s main componers, from the Notre Dame school, were Leoninand Perotin.
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Ars Nova (Latin for “New Art”) originated as the title of a treatise by Philippe de Vitry around 1320 and signifies a major innovation in musical notation and rhythmic practice, marking a departure from the earlier Ars Antiqua and transforming polyphonic music in the 14th century.