- Binary form can describe a whole movement or a portion of a large unit.
- Rounded binary form: return of A1 or A1 + A2 in B2 (forerunner of the sonata-Allegro form).
- Balanced binary form or binary with cadence rhyme: return of A2 in B2.
Rounded Binary Form
Ternary Form (typical tonal structures):
- Each section is tonally closed.
- There is thematic contrast between A and B.
- Compound ternary form: e.g., minuet & trio or scherzo & trio. Each large section (minuet, trio) is itself some form of binary or ternary design.
- The Ternary principle is the basis for the rondo form.