Dustin is certainly right saying that physics is not really a key to understanding the high level aspects of music, or a least to the relationship of music and emotion--

The thing is that you can't rule it out the scientific elements in the emotional impact of music altogether, because so much of the evolution of music comes from insights into ways that the harmonic aspects can be enhanced--this doesn't come only from development of new technology(like synthesizers or electric guitars, or finding a more resonant brass alloy), it comes into play in things like voicings--

The creative musician/composer is as much an engineer as anything else, because they work with finding and using repeatable ways of making sounds on instruments--

In a way, chords, and the system of harmonization that we use, are really a product of engineering--they were created and refined over the last 500 or
so years--based on an evolving understanding of the harmonic principles of phyics, or maybe physics evolved from the musicians understanding of harmonics--Pythagoras was, after all, a musician--