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I'll think and suggest some more, but one obvious starting place (to me) is reading Aristotle's Poetics next to his Rhetoric. Since the poetics defines tragedy by its rhetorical effect on its audience (i.e., a tragedy is a play that evokes a catharsis of pity, fear, and other such emotions), it is a kind of rhetoric of tragedy. (N.B., All those rules people remember about how a construct a tragedy, Aristotle supports by asserting that they are most likely to evoke the defining catharsis--formalism was, in my opinion, a later misreading). Rick Coe