What term describes the contrasting middle section of a minuet, often following ternary form?

The term that describes the contrasting middle section of a minuet, often following ternary form, is "trio." In musical compositions, especially during the Classical period, the minuet is typically structured in a ternary form, labeled as ABA. In this structure, the 'A' sections represent the minuet, while the contrasting 'B' section is known as the trio. This trio provides a different character or mood, often featuring a lighter texture or a different key compared to the minuet theme.

Understanding this structure is essential for recognizing the way composers balanced form and contrast in their works, particularly in chamber music and orchestral settings. The trio serves to enhance the overall musical experience and is a fundamental concept in the study of classical music forms.