What is musical form with recurring theme?

Musical form with a recurring theme is often referred to as "theme and variations." In this structure, a specific theme is presented and then altered in subsequent repetitions through changes in melody, harmony, rhythm, or instrumentation. This form allows composers to explore creativity while maintaining a recognizable central idea, making it a popular choice in various musical genres. Other forms, like rondo and sonata-allegro, also feature recurring themes but in different structural contexts.