The medieval polyphonic form that resulted from the addition of texts to the upper parts while retaining the Gregorian chant in the lower part is called the:

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This describes the development of the motet, which originated in the 13th century as a polyphonic setting of a sacred Latin text added to an existing chant melody in the tenor line. This allowed for greater complexity and expression in the musical composition.

The Medieval Polyphonic Form That Resulted from the Addition of Texts