I listen to Jazz from time to time.
The thing to keep in mind with genres like "Jazz", "Classical", "Rock"... is that they're more useful for organizing a record store than really knowing if music is good, or something that I'll like.
IE, Ella Fitzgerald, Dave Brubeck, Miles Davis all have very different styles.
Personally, when I've listened to "genre" compilations (~20 years ago) or playlists (now,) they have a few songs from artists that I love, and then a lot of decent songs from different artists. But, when I listen to the other artists (who I don't know well) on the compilations, they tend to only have a few good songs or even end up being "one hit wonders."
Anyway, most of the music that I really like tends to borrow heavily from other genres. For example, when I was younger I really liked Emerson, Lake, and Palmer, who borrow heavily from jazz and rearrange classical music as rock. Yet, when I listen to Reach (Jacky Terrason,) some of it sounds like a demo for Emerson, Lake, and Palmer, just waiting to be rearranged for a rock trio with moog overdubs.
> Modern music, and especially modern pop music, is incredibly harmonically simple. You rarely hear anything beyond a 7th chord.
I suspect the same can be said about most "pop" music in the past. (Although I can't pick apart what the chords are just by ear.) When I go back and listen to older "pop" music, a lot of it isn't great. (IE, I poked around Badfinger for a few minutes because Paul McCartney wrote a song for them. They had one hit (Paul's song) and the rest didn't keep my interest. Or I poked around Redbone because Come and Get Your Love was the theme for F is for Family and they also had one hit and the rest didn't keep my interest.)
Or, a different way to put it: Abba, The Beach Boys, and The Beatles were the outliers and many of their contemporaries weren't much better than today's pop artists. I think the difference today is that the great musicians aren't "pop" anymore.