What term describes a musical form with a structure of ABA?

The term that describes a musical form structured as ABA is known as ternary form. Ternary form consists of three sections: the first section (A), followed by a contrasting section (B), and then a return to the first section (A). This structure allows for a clear distinction between the two contrasting sections, while also providing a cohesive framework that revisits the initial musical material.

In contrast, binary form features two contrasting sections (typically labeled AB) and does not include a return to the first section, which differentiates it from ternary form. Rounded binary form is a variation of binary form that includes a return to the A section, but it does not establish the clear ABA structure characteristic of ternary form. Verse-chorus form is a structure frequently used in popular music, but it does not fit the ABA categorization. Therefore, ternary form accurately describes the musical structure of ABA.