La influencia del Papado de Aviñón sobre la música medieval española : la aparición del estilo ars subtilior

I am not a musicologist but for more than twenty years I have been regularly cultivating Gregorian chant. In the same way, personally I feel very close to medieval music. Preparing a training course for librarians specialised in music, Ifound a style called "Ars Subtilior" which is generally little known even among musiáans, as it only lasted a few decades in the Middle Ages in France, Spain and Italy. I consider it important to provide some historical and theoretical data needed to understand the importance of this revolutionary new style in its historical context