What it is
Elements of Sonata Theory (Oxford, 2006) by James Hepokoski and Warren Darcy proposes reading sonata form not as a mold but as a set of eighteenth-century norms and expectations: the composer makes choices relative to these norms (first-, second- and third-level defaults), and “deformations” are expressive choices. Together with Caplin, it is the model most used today in analysis courses; the two approaches are complementary (Caplin looks at phrase functions, Hepokoski–Darcy at the large stages and the “rotations”).
The abbreviations
| Abbreviation | Meaning | What it does |
|---|---|---|
| P | Primary theme | asserts the tonic |
| TR | Transition | increases the energy, often modulates, ends with the MC |
| MC | Medial caesura | the “central pause”: a half cadence (I:HC or V:HC) followed by a break (a rest or a filler) that opens the door to the secondary theme |
| S | Secondary theme | in the new key, aims for the EEC |
| EEC | Essential Expositional Closure | the first satisfactory perfect cadence in the new key that closes S: the most important point of the exposition |
| C | Closing zone | post-cadential material after the EEC |
| ESC | Essential Structural Closure | the equivalent of the EEC in the recapitulation, in the tonic: the true goal of the movement |
Types of exposition
- Two-part: with a clear medial caesura, P–TR | MC | S–C.
- Continuous: without an MC; the energy of the transition “carries” through to the cadence in the new key without a clear separation. Frequent in Haydn.
- Trimodular block (TMB): two successive MCs, with a first S that “doesn't get going” and a second that settles.
Rotations
The material of the exposition (P–TR–S–C) is retraced in order in the following sections: the development is often a partial rotation (it begins with P or with C and proceeds), and the recapitulation is a complete rotation in the tonic. Thinking in rotations also helps in understanding nineteenth-century forms and pop songs (every verse–chorus “cycle” is a rotation).
The five sonata types
| Type | Description | Examples |
|---|---|---|
| Type 1 | exposition and recapitulation, with no development | opera overtures, slow movements |
| Type 2 | binary: the second rotation begins with a development of P and continues with S in the tonic (there is no recapitulation of P in the tonic) | Domenico Scarlatti, many movements of the early Classical period |
| Type 3 | the “textbook” sonata: exposition, development, recapitulation | Mozart, Beethoven |
| Type 4 | sonata-rondo | finales by Mozart and Beethoven |
| Type 5 | concerto sonata (orchestral ritornello + solo exposition) | Mozart concertos |
Worked example (Mozart, Symphony No. 40 in G minor, K. 550, I, general outline)
- P: the famous string theme in G minor.
- TR: loud and energetic, heading toward the dominant of the relative major; MC on a half cadence in Bb, followed by a pause.
- S: descending chromatic theme exchanged between strings and winds in Bb major, with expansions before the EEC.
- C: codettas based on the motif of P.
- Development: rotation based on P, with remote modulations.
- Recapitulation: S returns in G minor (not in the major): the ESC closes in the minor, and the “tragedy” of the movement lies precisely in this choice.
Why a producer needs it
- The concept of the medial caesura is extremely useful: before a new theme or a chorus you need a half cadence + a break (a drum break, a half-beat gap, a riser that stops). Without a “pause,” the new theme arrives as a continuation.
- The EEC corresponds to the first full cadence of the hook: if you avoid it (deceptive cadence) and postpone it, you create the “extended chorus” that pop uses in the last repetition.
Related
Sonata form, Caplin's formal functions, Monothematic sonata form and other variants, Sonata-rondo, Solo concerto, Ambiguity and expectation (Bernstein).