Which characterizes the structure of a rondo in musical composition?

In musical composition, a rondo is characterized by a primary theme that recurs multiple times, interspersed with contrasting sections or ideas. This structure typically follows the pattern of A-B-A-C-A-D-A, where "A" represents the main theme and "B," "C," and "D" represent different contrasting ideas or episodes. The returning main theme provides a sense of familiarity and balance throughout the piece, making it a defining feature of the rondo form.

This approach allows composers to explore variations and emotional shifts while anchoring the listener with the recognizable main theme. The element of recurrence in the rondo form enhances its appeal and maintain engagement, showcasing both creativity in the contrasting sections and the unity of the returning melody.

Other options reflect misunderstandings of the rondo structure or address different musical forms. For example, a single continuous melody throughout describes a different form, while strict adherence to a single time signature pertains more to rhythm than thematic development. Similarly, equal importance given to all themes without repetition does not align with how rondos function, as the returning theme is central to the form.