To be honest, I chose 20th century because I couldn't really narrow down my preference to one century. For the 20th, though, I'm interested in l'Oulipo, especially Robbe Grillet, and to a certain extent l'Oubapo.
Otherwise, my interests are in theories of performance, specifically performance involving music (i.e. troubadour lyric, opera, etc.), and perception/presentation of gender. Right now, I am particularly interested in representations of feminine madness, especially from 19th and 20th century opera (Donizetti, Thomas, Strauss, etc.) but also from French literature (Flaubert, Françoise Sagan, etc.).