http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=11786twelve-tone music http://general-terms.thesaurus.ekt.gr/vocab?tema=11786 twentieth-century music BT http://general-terms.thesaurus.ekt.gr/vocab?tema=11786 total serialism RT http://general-terms.thesaurus.ekt.gr/vocab?tema=11786 musical expressionism RT