Is a term applied to medieval music that consists of gregorian chant and one or more additional melodic lines.

ORGANUM is a term applied to medieval music that consists of Gregorian chant and one or more additional melodic lines.

Explanation:

Organum is a singing technique that finds its roots in the Middle Ages. It was a polyphonic chant that consisted of only two voices overlapped.

The first records we have of the Organum's structure is from a document called "Musica Enchiriadis", dated c. 900, from an anonymous writer.

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