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Performance as an alternative medium uses theater, song, and performance art as a means of engaging audiences and furthering social agendas. Performance art is an avant garde art form that typically uses live performances to challenge traditional forms of visual art. It operates as "the antithesis of theatre, challenging orthodox art forms and cultural norms." Playing an important role in social and cultural movements from Dada and Surrealism to Post-Minimalism, performance art reflects the political environment of the time. While performance art is often relegated to high art, street theater is typically used in a grassroots fashion, utilizing local communities for performance or conversation. It can be used as a form of guerilla theater to protest, like in the case of The Living Theatre which is dedicated to transforming the hierarchy of power in society through experimental theater.