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mads.xsd"><authority><topic authority="http://general-terms.thesaurus.ekt.gr/vocab">twentieth-century music</topic></authority><related type="narrower"><topic>aleatoric music</topic></related><related type="narrower"><topic>atonal music</topic></related><related type="narrower"><topic>computer music</topic></related><related type="narrower"><topic>electro-acoustic music</topic></related><related type="narrower"><topic>minimal music</topic></related><related type="narrower"><topic>musical expressionism</topic></related><related type="narrower"><topic>musical impressionism</topic></related><related type="narrower"><topic>musique concrete</topic></related><related type="narrower"><topic>neoclassicism</topic></related><related type="narrower"><topic>neoromanticism</topic></related><related type="narrower"><topic>open form music</topic></related><related type="narrower"><topic>postmodernism</topic></related><related type="narrower"><topic>reiterative music</topic></related><related type="narrower"><topic>stochastic music</topic></related><related type="narrower"><topic>total serialism</topic></related><related type="narrower"><topic>twelve-tone music</topic></related><related type="broader"><topic>music</topic></related></mads>