A form in which a single melodic unit is repeated with successive changes to arouse the listener's interest is called:

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Variation form is a musical form in which a single melodic unit is repeated with successive changes, such as harmony, rhythm, timbre, or texture. This creates interest and variety while maintaining a sense of unity throughout the piece. The changes often build up to a climax and then return to the original theme, creating a satisfying sense of closure. Examples of variation form can be found in classical music, jazz, and popular music.

A Form in Which a Single Melodic Unit Is Repeated