Assertion: pianist's work | /r/HasProperty | late string quartets
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Source sentences:
text: He returned to the keyboard to compose his first piano sonatas in almost a decade: the works of the late period include the last five piano sonatas and the Diabelli Variations, the last two sonatas for cello and piano, the late string quartets (see below), and two works for very large forces: the Missa Solemnis and the Ninth Symphony.[citation needed]