Nature is raw, uncontrolled, pure creative chaos, bounded only by death.
Music is rarified, controlled, distilled creativity; it is the conscious combination of individual universal truths (harmonies and motifs) to form a pathway (as the music progresses and modulates) to a sort of transcendence.
The common musical structure of simple to complex and then back to simple is important because the ‘simple’ represents our human state and the ‘complex’ represents the transcendent state. The return to the simple brings us back into our selves before the piece ends.
The composer’s destination, and the listener’s goal, lies in the complexity of the piece and is a sort of immersion in, recognition of, and understanding of (perhaps achieved in that order) some aspect of the human experience, viewed with the clarity of the outside perspective of the transcendent state.
The composer leads us to understanding through the musical journey, the progression, development and modulation of themes, but the truths themselves are expressed through harmonies. A single chord carries deep meaning.
Harmony is a representation of truth, of celestial order, of God. Music is a distillation of the mortal human experience, the removal of nature’s chaos and death leaving only the eternal, and perhaps the most accessible pathway to the divine.