In music, what is the term for a structure that often starts and ends with a theme, creating symmetry?

The term that describes a musical structure characterized by beginning and ending with a theme, creating a sense of symmetry, is known as arch form. This structure typically features a sequence of themes that are presented, developed, and then return to the original theme, giving the piece a balanced and cohesive feel.

Arch form is particularly effective in creating an emotional journey as it allows listeners to experience growth through the development of themes while ultimately providing closure by returning to the starting point. This format is reflective of various forms of art where symmetry and balance are desired qualities.

In contrast, the other options represent different concepts in music. A coda serves as a concluding passage that brings a piece to an end but doesn't necessarily encompass the symmetry found in arch form. Rondo is characterized by a recurring theme interspersed with contrasting sections but does not inherently focus on symmetry around a central theme. Theme and variations involves altering a theme through different iterations but lacks the structural return that defines the arch form.