Ramón Barce, there is no doubt, are one of the more prolific Spanish composers writing about problems surrounding 20th Century music. His thought has influenced to many composers, helping them, indirectly, to take their own compositive way. This article, from the analytical point of view, is about two of his more significant works for his creative corpus, detailing the employed systems for those compositions and their formal development. Since this perspective, this article shows the influence of Barce's collaboration with the more committed new tendencies and with the construction of a personal compositional system, being these two distinctive features which marks the majority of his production.Ramón Barce es, sin duda, uno de los composit...