Most writers have thoughts kind-of assemble in their heads which they write down and this is some rambling along those lines, so bear with me.
A couple guys I know are big conspiracy theory nuts, and they talk a lot of nonsense, but occasionally they say the occasional rational thing so I listen with one ear if only because there might be some good fiction out of it. One thing they often preach is that emotions vibrate at a certain frequency. They say there are two opposing emotions in the vibrational spectrum, Love and Fear and that all emotions are somewhere between those two on that spectrum... then they go on about how transcendence and enlightenment are simply shifting to a different vibrational frequency... like I said, nonsense.
But I do think there is more to vibrations than meets the eye (or the ear as the case may be). A small vibration at the right resonance can create massive catastrophes in civil structures. This is such a concern that engineers are required to account for this in their designs.
All humans are extremely sensitive to vibrations and intuitively recognize dissonant tones in music. If I play a scale on a piano for anyone they'll instantly know if I'm using the correct flats and sharps for that key scale based on the sound, even on a minor scale the dissonant notes are offset so they sound right to our ears. This is intuitive, not a learned ability. Another point I will make is that ALL people gather some enjoyment from music. No one I know has ever said "I don't like music." They might not like a particular TYPE of music, but the very idea of disdaining all music would probably prompt many of us to evaluate the mental stability of the person making the claim. Why is this? Humans are nothing if not varied, so why do all people derive pleasure from music of some sort?
This leads me to wonder if my crazy friends might be on-to something...