In this paper concerning Agostino Di Scipio's music, music philosophy will try to suggest that musical analysis can not limit itself to “objective” structures (“sound”, “form”, etc.). Composing with an ecosystemic approach, Di Scipio creates an audio system that interacts with the environment. The space in which and from which music emerges is also the listener's space. The notion of emergence is complex: what emerges is the result of a confrontation between the cognitive system of the listener and the audio system. This emergent result could be called “musical structure” or “sound structure”, but remains difficult to define precisely. In general outline, it remains unpredictable and unstable. It is dependent on a dynamic musical space constructed simultaneously by an active listening and an active audio system. To choose either as a starting point for the emergent structures is impossible. This is why Di Scipio's music analysis is so difficult. Analysing it, one has to focus on the ephemeral moment where music emerges in the interaction between the listener and the product of the audio system, and inside a specific space.