Cantus Firmus refers to a pre-existing melody, often taken from Gregorian chant or other sources, that serves as the foundation for composing polyphonic music. It remains unchanged while other voices are added around it.
Polyphony: Polyphony is a musical texture where multiple independent melodic lines are played or sung simultaneously. Cantus firmus can be used as one of those melodic lines.
Chorale: A chorale is a hymn-like musical composition typically written for congregational singing. Many chorales use cantus firmus technique by incorporating an existing melody into harmonized parts.
Imitation: Imitation refers to the repetition of a musical idea in different voices or instruments throughout a composition. In cantus firmus compositions, imitation can be used to develop new material based on the original melody.
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