What is a "simple musical form" characterized by?

A simple musical form is primarily characterized by the notion that it cannot be divided into smaller, self-contained works. It typically encompasses straightforward structures that focus on clarity and cohesion, such as binary or ternary forms, where musical ideas are presented in a clear, easily identifiable manner. This simplicity allows listeners to grasp the overarching musical themes and structural integrity of the piece without getting lost in complexity.

In contrast, the other options focus on aspects that do not apply to simple musical forms. Complex interwoven melodies suggest a level of intricacy that is more indicative of contrapuntal compositions or developed polyphonic textures. Multiple variations of a single theme belong instead to more complex forms like theme and variations, which take a basic idea and elaborate upon it in various ways. Integration of contrasting styles, such as fusion genres, generally creates a rich and complicated musical environment, moving away from simplicity. Thus, the idea that simple musical form is indivisible and straightforward is what makes it distinct and defines its characteristics.