Music occupies a remarkably wide conceptual territory in the depth-psychology corpus, functioning simultaneously as cosmological principle, psychic quality, neurophysiological regulator, and vehicle of transcendence. At one pole stands the Ficinian-Neoplatonic tradition, recovered chiefly by Thomas Moore, which distinguishes three orders: musica instrumentalis (audible sound), musica humana (the rhythmic patterning of soul), and musica mundana (the harmonic structure of the cosmos itself). In this framework, audible music ranks lowest; the higher music is ontological, an elemental quality of psyche parallel to air in nature. Iain McGilchrist situates music squarely within right-hemisphere epistemology: music is constituted entirely by relational ‘betweenness,’ and its migration toward explicit, language-like structures in modernity signals a dangerous hemispheric imbalance. James Hillman recovers music’s Saturnine-melancholic register, linking it to the hidden interior earth and to the nostalgia of spirit for an invisible domain. At the neurophysiological pole, Porges and Dana demonstrate that music operates directly on autonomic state through neuroception, sending signals of safety or danger. Keltner and Harrison document music as a primary elicitor of awe and frisson — transcendent psychophysiological experiences with cross-cultural validity. The tension between music as cosmic-psychic structure and music as autonomic-neurological event runs through the entire corpus, making this term a pivotal site for the dialogue between depth psychology and embodied science.