I am curious about the OP experience with sound....
Sometimes ago I listen only music or sound that suit my conscious taste...But for about a year now I observe exposing myself to certain sound ( perhaps better say frequencies) had certain negative or positive effect, or reinforcing effect...It is feed back and placebo also, but more than that, there is really an objective side effect to the effect of sound from the cellular to the conscious level...I am not a scientist, but I have my experience...And there is much out there for those who want to read...
For sure these experiments with sound healing are more convincing and easy to make for someone that is already in pain, hurted, or very sensible ( I am), otherwise collective blind test with corticoid production measurement protocols for example are mandatory for the research...
like this one:
https://www.researchgate.net/publication/327439522_Effect_of_528_Hz_Music_on_the_Endocrine_System_an...
My best to all...