Focusing on matters of power and difference, this article examines rhetorical theories of genre and James Gee's theory of Discourse. Although both theories offer productive ways of understanding literate practice, it is argued, they are limited in crucial respects. Genre theory offers few ways of understanding how and why some social actors have an easier time than others in producing generic texts and getting their texts deemed "legitimate" by recognized authorities. Gee's theory, meanwhile, does not explain precisely how and where (i.e., at which conceptual level) communicants come to match Discourse to situation. This article contends that these limitations may be surpassed if the two theories are brought together in a particular way. In this new approach, genres and Discourses are viewed as mutually constitutive forms: Genres exist within Discourses and Discourses exist within genres. In adopting this approach, it is argued, researchers may study how particular genres are made to elicit performances of Discourses connected to particular social groups. (Contains 3 notes.)