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If I could find a source for it, I'd add Mozart's Piano Sonata KV 570 as another surprisingly early example. It has similarities to the outer movements of Schubert's second symphony, but is of course a lot shorter. (First theme in tonic; contrasting theme in subdominant; then the first theme returns, but at the dominant.) Double sharp (talk) 10:13, 28 August 2021 (UTC)
Pathetique
editI'm fairly certain the first movement of [[1]] would also count as a three-key exposition with this structure:
Theme 1: C minor theme, Bars 11-26 Transition: Bars 27-50 Theme 2: Eb minor theme with hand crossing, Bars 51-88 Theme 3: Eb major theme with descending bass line, Bars 89-112 Codetta: Bars 113-134