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In page John Cage:

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This concept of circus was to remain important to Cage throughout his life and featured strongly in such pieces as Roaratorio, an Irish circus on Finnegans Wake (1979), a many-tiered rendering in sound of both his text Writing for the Second Time Through Finnegans Wake, and traditional musical and field recordings made around Ireland. The piece was based on James Joyce's famous novel, Finnegans Wake, which was one of Cage's favorite books, and one from which he derived texts for several more of his works.