A♭ major governs all 73 measures without modulation. The apparent modal shift in the central episode — a turn to A♭ minor with chromatic-third motion to ♭III and ♭VI — is a controlled digression within the tonic region, not a departure from it. Every chromatic event in this movement happens inside a single, unbroken key.
The rondo theme's harmonic cycle returns to where it began, phrase after phrase, withholding the chromatic tension the key is capable of. Beethoven banks that impulse deliberately — when the episodes arrive, he releases it all: every non-diatonic colour, every destabilising inflection, in precisely the sequence the theme had implied and refused to deliver.
The varied return evades the expected final cadence — the dominant arrives on a weak beat, the inner ostinato runs through without caesura, and the tension passes unresolved to the coda. The movement ends through plagal motion and registral descent: three bare tonic statements, each lower than the last, the texture thinning to nothing.
A♭ major. Rotational harmonic cycle, returns to tonic rather than driving toward a goal. Two-part arch: bare statement then intensified restatement, closing with a PAC at m. 329 b.2.
C major introduced — E♮ lying outside A♭ major — as colour, then structural event, then dissolution. Closes without cadence: a chromatic descent converges on an open dominant pedal, texture reduced to near nothing.
Opening phrase reproduced with near-literal fidelity. What is missing is the intensified restatement: the phrase closes with a weak IAC rather than a PAC. The truncation is marked entirely by what does not happen.
Direct shift to A♭ minor — mode, not key. Chromatic-third excursion to ♭III then ♭VI, a sustained common tone threading all three harmonies. Returns to A♭ major via a diminished-seventh bridge, no cadence.
A♭ major restored, surface transformed: inner-voice figuration richer, chromatic passing tones absorbed as native elements. The expected final cadence evaded — dominant on a weak beat, tension passed unresolved to the coda.
Plagal IV–I motion, confirmatory rather than argumentative. Melody descends by successive thirds to bare tonic. The movement ends through registral and textural withdrawal, not harmonic resolution.
Ludwig van Beethoven, 1770–1827.
Op. 13 · 1798 · 2nd Movement.
Adagio cantabile · ♩ = 30 · 73 mm.
Theme · Episode 1 · Truncated return · Episode 2 · Varied return · Coda
PAC closes theme first statement · varied return evades final cadence
No transposing instruments · concert pitch throughout
Movements 1 and 3 of Op. 13, the Pathétique↔Nimrod connection — and how Elgar's Enigma Variations quotes the Adagio cantabile in Variation IX.
Analysis and study materials published as they appear.