I think another factor is the use of music for exercise noise, like while running or attending a fitness class at the gym. The instructors don’t care what the music is as much as they care about how many beats per minute, and they adjust the tempo to match the moves. This does not lend itself to creativity.
My go-to when I used to run were rock operas such as The Wall, Thick as a Brick, A Passion Play, Quadrophenia, etc. Those worked for me. Couldn’t imagine listening to an hour of electro music.
to SL: There are a number of reasons why music changes so radically in the early 1950s, and you would have to take my course in the history of rock music to find out about them all🙂 but the one that fits here is that 1952 is the first year that all high schoolers were too young to remember the Depression, and didn't remember much of WWII, and moreover, they were the demographic with the most disposable income--their parents had lots of money and lots of bills, but every dollar in a teen's hand was disposable, and the music execs began to realize this and aim their music to teens, who knew little about music but had lots of hormones to be ginned up by music.
to M21: music is so easy to obtain today that it has ceased being an art form and has become a utility, to be used as a drug for stimulation or calming, excitement to worship, and it is EVERYWHERE. In my courses my first assignment is for my students to avoid all music for 24 hours. It drives them nuts; they're all addicted to the beat and the drone. Break that addiction, and you begin opening their ears to beauty and depth in sound.