What is contemporary theatre and modern theatre?

“Contemporary performance is hybrid work that integrates text, dance, objects, music, costumes, lighting, image, sound, sets, and vocal expression into complex interactive systems. Contemporary performance names a body of work that builds on an aesthetic history beginning in the 1880s with Alfred Jarry and early Dada experiments and unfolds through into the American avant-garde and Performance Art of the 1980s. Contemporary performance collages are often non-narrative, technically rigorous, and carefully orchestrated anarchic chaos. They unsettle perception, demand critical engagement from audiences, address conceptual debates within aesthetics, draw on a diverse range of cultural interests, and bring pleasure to populations across the globe.” - Morgan v. P. Pecelli at lostnotebook.com