Curated by Ignacio Barcia and Iñaki Martínez Antelo, the exhibition Mirar o son, which brings together more than two hundred documents, proposes an approach to the new forms of musical notation that have emerged from approximately the middle of the 20th century to the present day. It shows examples of non-conventional scores in which their visual dimension predominates, or which adopt non-standardised languages and notation systems. These scores respond to the notation needs resulting from new musical forms, new compositional processes, the notation requirements of extended forms of interpretation, the expansion of the sound materials used or even, on occasion, the use of writing or visual creation as a field of compositional experimentation. We often find connections with multidisciplinary creative movements, as in the case of the Fluxus movement, where artists from the visual arts, music, experimental writing and other disciplines came into contact with each other. Thus, graphic notation can be understood as a sort of overlapping of the visual with what, in a significant neologism, is called "aural".