
There was a university study done, where it actually analysed the melodic and lyrical content and structure of tens of thousands of songs over different decades and proved conclusively that modern popular music is becoming more formulaic. It is gradually using less and less diversity of language and vocabulary and an ever narrower range of melodic content. There is even a vocal pattern that is noted as being used that the lead author of the report coined a phrase to describe - "the millennial whoop", which is a one third ascending vocal slide (from memory).
Sorry, cannot remember which US College it was, or the lead author, but google it if you're interested, I am sure there was a YouTube piece about it....
I can't find where it is, but i'm pretty sure they did research where they asked people of different age groups to respond to music from different era's.
From memory, there was an obvious preference to music from that person's teen and 20's expereince, so a 50 year old probably prefers music from the 80s/90s , a 40 year old likes 00's etc.
However there was a spike across all age groups when it came to music from the late 70s.
The music companies like the current status, it gives them full control, and its hard for rebellious artists to stand out.
The way they chart songs is pretty different now.
Lava Chicken made the Billboard top 100.
No way that back in the olden times anyone would have bought a single of that.
( and even back then people who purchased singles were kind of weird, who the hell would have bought 7 singles instead of just buying the Thriller record. Thankfully i didn't buy any Michael Jackson ever ).