I think rap is something that many “like” because they are of an age where they think they are “supposed to like it”, I say this because my kids, nieces, nephews and now grandkids are all intimately familiar with the music that I grew up with.
They own it, know all the words and have the classic stations set on memory in their cars and on their streaming services.
I was barely aware of the existence of specific music performers and songs from eras before my teens when I was growing up, I was blown away by the stuff being made in my time; in later years I discovered a lot of great “oldies” but I had no idea where to find the classic rock station on my radio in the 1970’s or 80’s.
I think the reason why the young today are so familiar with the older music is because their music sucks for anything beyond checking the “box” that says they are part of the modern culture.
The modern culture celebrates being a “follower” and embracing group think, rap is PC so it is “popular” but my nieces play the same songs in the car as they take their kindergarten kids to school that their mothers played when they were the kiddies strapped in the carseat.
The Eagles “Greatest Hits” from 1973 just surpassed Michael Jackson’s “Thriller” as the all time best selling album in history; I didn’t care for “Thriller” but does anyone really think that a modern artist will ever even threaten those sales records?
I doubt it because you can’t sell crappy music to anyone except those who feel obligated to buy it, if the music industry keeps stifling everything but the crap it will just continue fueling the overwhelming popularity of the former music; and the underground artists