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In the chapter on "Hybrid Themes and Compound Themes" in Classical Form, William E. Caplin notes that one potential hybrid theme is mostly absent from the repertoire. To quote in full:
Of all the logically possible ways in which the various phrases of the sentence and period can be combined to make a hybrid, one pattern is conspicuously absent—a theme that begins with a presentation and ends with a consequent. As shown in Figure 5.2, such an arrangement of phrases brings a threefold statement of the basic idea. The resulting redundancy of material within an excessive tonic prolongation likely explains why this potential type of hybrid seldom appears in the repertory (p. 63).
He gives something like the following diagram for this mythical sentence+period centaur (Fig. 5.2, p. 63):
Perhaps to reinforce the argument, not a single example of such a threefold basic idea is given in the book. So I ask you, collective wisdom of SMT: do you have any examples of a phrase/piece which begins by stating its basic idea three times?
I've got one example, which I'll share to start the discussion: the slow movement of Haydn's Symphony No. 46, which repeats its basic idea three times. It's not a perfect example - it follows a model that I'm tempted to call, within Caplin's system, "presentation + continuation," since it lacks both a strong cadence, and the 'contrasting idea' in mm. 7-8 that the diagram demands. That's not ideal, since "pres. + cont." is essentially his label for a normal sentence...but it's a start!