I agree that the central scientific question is whether harmony is a metaphor or mechanism, e.g., for psychological constructs like Cognitive Dissonance. My guess is that harmony is so pervasive that it ceases to have original meaning -- like in the manner that every atom is a harmonic oscillator or how brainwaves are based on an "octave" structure (e.g., Beta is double Alpha, Gamma is double Beta, etc). However, this question of metaphor or mechanism should be resolvable with science, eh?
However, I disagree that harmony is primarily a western phenomena. It is a central feature to Confucianism and Daoism. It also plays a major role in Native American philosophy.