The early compositional style consisting of a plainchant melody with another melody sung simultaneously with the same words is called:

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This early compositional style is called "organum" and involves adding a second voice to a plainchant melody, usually singing in parallel motion. Monophony refers to a single melody without accompaniment, Gregorian chant is a type of plainchant, and an estampie is a medieval dance.

The Early Compositional Style Consisting of a Plainchant Melody with Another