Mariano Etkin is an Argentinean composer, among the most important Latin-American composers of the second half of the twentieth century. He received his main musical education in his hometown, Buenos Aires, and continued his studies in the United States and Europe. Both his musical creation and his theoretical production are a benchmark for composers and researchers. By exploring perception thresholds, Etkin’s works unfold between real and apparent in a profuse and ambiguous sound world. His writings address the study of musical works and issues around music creation.