This is a remarkable work, rich in ideas and provocative in its conclusions. Assis offers a transformative approach to music performance, which serves as a paradigmatic instance of artistic research. But he also provides the conceptual framework for a general ontology and epistemology of art, one that has implications well beyond the domain of music. This is a book that deserves the attention of researchers throughout the disciplines of the arts, humanities and social sciences.Bogue, Ronald, jar-online.net. 19/12/2019. https://doi.org/10.22501/jarnet.0023