Final answer:
Gregorian chants are an example of monophony, which means they consist of a single melodic line without harmonies or accompaniment.
Step-by-step explanation:
Gregorian chants are an example of monophony, which means that they consist of a single melodic line without harmonies or accompaniment. This type of music was prevalent during the earlier medieval period and was predominantly used in liturgical ceremonies. It is characterized by a single voice or melody that is sung in unison by a group of singers or a soloist.