Assertion: concerto's section | /r/HasProperty | built on main theme
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text: The final section, the coda, is built on the main theme, but even here (398) Brahms presents a new element, restating the main theme in triple rhythm (a device he used earlier to end his violin concerto) over a little march, first played by the piano, then answered by the orchestra, which trades themes with the soloist before the final chords.