Check a book entitled : The Agony of Modern Music, by Henry Pleasents. It is a good read about the evolution of modern music focusing mainly on the classical generation of geniuses; specifically the Wagnerian revolution.
The elimination of melodious complexity in modern music is another form of dumbing down associated with doing away with aspects that stimulate abstract thinking. A symphony, a chamber orchestral piece, an opera, are like poems, in the form of sounds, that inspire the imagination. The monotony and drabness in modern music is why it can be played everywhere as background noise, in every public vicinity, because it has no depth, no melody, other than simplistic beats that become lodged into the mind. Modern Crappers, rely on mindless repetitiveness, as an easy way to force people to remember their shit songs, and then they throw in that tribal electronic dance excrement, in to compensate for the mediocrity and appeal to peoples sensuality and hedonistic proclivities.
The 80’s and 90’s rock era was a science in using repetition in their music. Which is why those songs are overplayed to the point of making one vomit. They are easy to listen to, easy to remember and require no effort to understand, and the tunes are catchy enough to force one to remember even against their will; the age of overplayed music has become so much like a contagion on society that it has turned into a form of mind control. I can’t count the number of annoying fucks ive come across who can’t think about music without referencing some overplayed piece of shit.