Which best describes binary form in music?

Binary form in music is characterized by its structure of two distinct sections, often labeled as A and B. Each section typically has its own musical ideas or themes, providing contrast while also maintaining a sense of unity within the piece. This form is commonly found in various styles of music, particularly in dances and instrumental pieces from the Baroque period.

The A section presents a theme or musical idea, while the B section often introduces a contrasting theme or accompaniment. After the B section, the piece may return to the A section, but this repetition is not necessary for the form to be considered binary. This element of difference and contrast is what highlights the effectiveness of binary form in creating interest and progression within a composition.