Organum was an early form of what major musical development

Because of the domination of the early Christian Church during this period, sacred music was the most prevalent. Beginning with Gregorian Chant, church music slowly developed into a polyphonic music called organum performed at Notre Dame in Paris by the twelfth century.

Because of the domination of the early Christian Church during this period, sacred music was the most prevalent. Beginning with Gregorian Chant, church music slowly developed into a polyphonic music called organum performed at Notre Dame in Paris by the twelfth century.