Answer :

Final answer:

Organum is the earliest type of polyphonic music developed during the Middle Ages, involving the addition of voices to Gregorian chant melodies.

Explanation:

The earliest type of polyphonic music that was developed during the Middle Ages is known as organum. Organum is a form of early medieval music that involves the addition of one or more voices to a pre-existing Gregorian chant melody. It was primarily practiced in monastic and cathedral settings, and it laid the foundation for the later development of more complex polyphonic styles.

The use of organum allowed composers to add harmony and counterpoint to the existing chant melodies, creating a richer and more textured sound. One example of organum is the Musica enchiriadis, a treatise from the 9th century that provides examples of early organum compositions. Overall, organum represents an important milestone in the development of polyphonic music during the Middle Ages, setting the stage for future innovations and advancements in Western music.

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