Musical forms and analysis (binary, ternary, sonata, rondo, song forms)
Domain focus
Form questions ask you to map a piece's sections, cadences and thematic returns, then name the structure with evidence.
Small forms
- Binary: A–B, often sectional or continuous; each part may repeat.
- Ternary: A–B–A, with a contrasting middle and a genuine return.
- Song forms: strophic, through-composed, modified strophic.
- Rondo: a refrain alternates with episodes: A–B–A–C–A.
Sonata form
Exposition: first theme in tonic, transition, second theme in dominant or relative major, closing. Development: fragments, sequences, modulations. Recapitulation: both themes in tonic, second adjusted. Coda optional.
Worked example
An opening theme in C major returns after a lyrical theme in G major; a development moves through A minor and F major; the return brings both themes in C. That is sonata form, not ternary, because the return resolves the tonal conflict and restates both themes.
Traps
Calling any A–B–A ternary when B is developmental; confusing sonata form with the sonata genre; missing a refrain in rondo; ignoring repeats when labelling binary; forcing a popular song into sonata form.