Short version: The sheer volume of music out there today will have better music than before, but that same volume makes it difficult to find.
Best year for music? 2021 (because 2022 hasn't finished, yet).
Why, because there's soooo much out there now. I would bet there are artists creating music now that puts every one of those above to shame. Problem is, finding it is a challenge.
I was thinking about this yesterday while listening to the radio. Modern media distribution, i.e. the internet, has given artists much easier access to get their music out into the world. Look at Macklemore. He had a successful single without a major record label. While he wasn't the first, it is much easier for an artist to do it today. Produce it at home on your computer, stick your music on Youtube or Spotify (or whatever people use these days) and you could have a hit without ever having a contract. The sheer accessibility of home recording and free promotion has enabled 1000's of artists, who would have never been heard by anyone more than family and friends, to reach a global scale.
However, finding that music is a challenge. I think the 90's were the sweet spot between new music and record label support. There was more accessibility for music distribution with a huge number of radio stations and music television which gave record companies more markets to sell to and thereby, more chance to pick up smaller artists or genre's to fill in those spots. Plus, because it was growing rapidly and record labels were tossing things out to "see what sticks", the average listener was exposed to multiple genre's of music. Look at MTV where in a hour of watching saw grunge, hard rock, glam rock, rap, pop, new wave, punk, funk, etc. All getting equal (relatively) exposure.
Going into the 2000's and beyond, as the internet picked up, more and more artists were able to bypass the record labels and thereby radio and television to get their music to people. This gave artists the ability to expand their specific music type to much deeper and more esoteric experiments without having a record label yelling at them "we need a single!" or "we need another hit single just like before!"
As a result, music has become less broad and more focused. An average young listener today (not counting us old farts because we were pre-wired for listening to a broader range), will probably stick to one music type simply because there are many options for them to expand into just that genre and never run out of new music to listen to. Furthermore, social media sites are designed to show a user more examples of things they already enjoy, thereby limiting their music knowledge to those suggestions.
I'm willing to bet there are music tracks (see, we don't even call them songs anymore) that would blow away any of the bigger artists from the past, but without it being shoved in our ear by the record label, you have to hunt for it. And hunting for it is difficult because there are 1000's of tracks you have to dig through to find it, and people just don't have the time to do it. So, they're more likely to stick to a specific type of music and expand that direction. BTW, I'm not saying it's a bad thing that record labels aren't force feeding us music like they did before in the payola days, just that it makes it harder for average listener to find new things they like.
-Rob