This paper proposes a theory to explain the remarkable emotional power of our response to abstract music. It reviews and rejects metaphysical arguments derived from notions of a divine spiritual realm and from absolute forms of human reason. Its conclusion is that musical experience is always essentially inter-subjective and potentially empathetic, and arises from "action-metaphors," through which we link musical performances, as forms of action, to subconscious, archetypal dimensions of our awareness of ourselves and of our feelings towards others. It ends with a discussion of the implications of this theory for music education.