Maarten Kloos Music, space and architecture: it is a concise summary of a whole universe. A trinity that brings together three notions, all of them extensive, multi-interpretable and hence difficult to define. Because each of them appeals to our associative power and therefore always encourages new and creative ideas, it is logical that a multitude and, especially, wide diversity of definitions can emerge over time, most of them closely linked to the time they were formulated. For a start, it is of course a trio of complex dualities of great complexity. The relation between architecture and space has something self-evident, which is why they have always traditionally been labelled without difficulty as the natural habitat of the architect. Music and space possess that to a lesser extent. More often, their mutual connection is considered to be an exceptional phenomenon, especially by composers of old. It is for good reason that the link between music and architecture, the most difficult to explain, has traditionally been the domain of theorists, among them both specialists in the two professions and writers, poets, philosophers and historians interested in a wide range of subjects. All this means that interpretations of the triad of music-space-architecture inevitably lead to making a choice. To which element do we give priority? What is the basic idea as, it were? In this publication that is deliberately â€˜spaceâ€™.