What is the cantus firmus? (1 point)

a melody that serves as the musical foundation for a mass
a melody that serves as the musical foundation for a mass the main melody of a cadenza the main melody of a cadenza the main melody of a concerto the main melody of a concerto a secular song from the Renaissance

The cantus firmus is a musical term that refers to a melody that serves as the foundation for a composition, typically a mass. To understand this concept further, you can break down the term itself. "Cantus" is a Latin word meaning "song" or "melody," and "firmus" means "firm," "steady," or "unalterable." Therefore, the cantus firmus is a "firm" or "steady" melody that forms the basis of a composition.

In the context of a mass, the cantus firmus is a pre-existing melody, often taken from Gregorian chant or another sacred source. The composer would then build the rest of the composition on top of this melody, using techniques such as counterpoint or harmonic progression. The cantus firmus provides a structural and musical foundation for the piece, and other voices or instruments would interact with and develop around it.

To summarize, the cantus firmus is a melody that serves as the musical foundation for a mass, providing a stable starting point for composers to build upon.