What is the music definition for contrast?

Contrast in music refers to the juxtaposition or alternation of different musical elements or qualities to create variety or interest. It can be achieved by varying dynamics, register, timbre, tonality, articulation, or other musical parameters. Contrast helps to shape musical phrases, sections, and overall compositions, creating a sense of tension and resolution, and adding depth and dimension to the music. For instance, a soft section followed by a loud section, or a slow section followed by a fast section, can create contrast and add dramatic impact to a composition.