Which term refers to a melody?

The term "descant" refers to a melody, especially one that is sung above a main melody or a drone in music. It is often characterized by its decorative or improvisational nature and is used to enhance the primary musical line. In many musical traditions, descants provide a contrasting yet harmonious layer, creating a richer sound. This term precisely aligns with the notion of a melody, specifically conveying the concept of an embellishment or melodic variation that complements the main theme.

In contrast, lamentation refers to an expression of sorrow or mourning, expedient pertains to a means of attaining an end, often implying practicality or convenience, and compunction describes a feeling of guilt or moral scruple that prevents or follows the doing of something bad. None of these options relate directly to the concept of a melodic line.