Old favorites: Tristan Tzara, Marcel Duchamp, William S. Burroughs, Kathy Acker, Eileen Myles, People Like Us, Dial-A-Poem Poets series, Angus Maclise, John Cage & Sun Ra, and Brion Gysin
Chances are, if you've ever taken an english class, your teacher would've told you that saying "they" to describe a person of indeterminate gender makes you a grammar neanderthal, though it feels so right. "He or she" is the proper thing to say. Singular "they" means you get the red marker.