I very much doubt that the frequency of music has anything to do with depression or aggression. As I pointed out the frequency between A440 or A435 or A532 is not discernable to most peoples ears and no scientific studies has shown any correlation that one frequency over another has any effect on mood or behavior.
When you listen to a piece of music, you are not listening to just the A440 frequency but to a whole and wide range of frequencies and notes.
Now if you want to discuss the lyrical and social content in, especially a lot of modern music, thats another matter. But that is IMO more a reflection of changes in social morals as a whole rather than the frequency of the music itself.
I would be more likely to blame the social ills you described to other factors such as the breakdown of the traditional family unit, i.e. marriage and two parent households, the increase of illegitimate children raised by single mothers who cant adequately care for them either physically or socially, the welfare state and entitlement mindset, the promiscuous sex without consequences, the breakdown of traditional neighborhoods and of the churches and schools and the morals that once used to be taught there. Sure a lot of modern music lyrically may promote such ills, but IMO didnt cause them but more likely are a reflection of them.
But it isnt cause by some violinist or some guitarist or trumpeter or saxophonist are tuning their instrument to A440.
First I’ll admit I haven’t read the article yet.
I have a seizure disorder, and one of my primary triggers is the music that is popular today (both pop and country). 80’s era music - no problem. Why would that be?