Discuss the influence of Brecht, Artaud, and Dada on the aesthetics of postmodern theatre. Thank You

Modern drama
was realistic, telling stories of everyday people, in a psychologically sound way.  With the
advent of 20th century experimental, artists began to test the rules of theatre, finding a
performance aesthetic that departed from simple story-telling formats.  Among the theorists who
championed this inquiry (Absurdism, Dada, Expressionism all drew from...