Final answer:
The section, which includes different voices repeating the central theme, is called the refrain.
Step-by-step explanation:
The section, which includes different voices repeating the central theme, is called the refrain. A refrain is a phrase or group of words repeated throughout a text to remind readers (or listeners) of an important theme. It helps create continuity of ideas and paragraphs and can also add rhythm and emphasis to the text.