this is a rhetorical question :)
I wanted to make this post not here, but in another thread, and it was supposed to be a bit expanded, but unfortunately I don’t have my notebook handy.
I’ll try to formulate it, maybe this answer will work for you and make you think and ponder.
what distinguishes harmonious musical sound from dissonance - unharmonious sound structures?
The ability to distinguish harmony from dissonance is inherent in every human being by nature.
In addition to the harmony of sound, our body is tuned to perceive the harmony of external and internal space (comfort or discomfort).
external and internal harmony are interconnected, a harmonious person creates harmonious creations and brings harmony to the world, as well as contemplation or other active perception of harmonious forms can tune the inner world of a person to harmony
All kinds of harmony in the world are interconnected, because they are subordinated to the basic conditions of formation of harmonious space.
these principles and relations correspond to all harmonious wave processes that originate in the inner space - the human body and mind, and as a consequence dictate feelings of comfort or discomfort, pleasure or irritation, acceptance or rejection, feelings of beauty or ugliness, etc., or the outer space - the harmony of sounds, visual images and all the diversity of external forms
principles and relationships are practical and based on physical processes.
the essence of the equations of harmony is that energy in harmonious forms is in cyclic movement, not stagnant, not blocked, but goes through all the circles and loops of its origin and transformation.
In other words, harmony is the optimal energetic existence, or the maximum manifestation of energy in the physical world.
harmony is not only contemplative, it is practical 
