I think part of that issue is that 20 years gives time for the cream to rise to the top. There was a LOT of terrible music in the 60s and 70s. The music from that era that you listened to in the 80s ...

Well, the idea of music genres is dying these days. I wouldn't even know how to genre-classify half of my liked songs from this year. Tags are more useful; what instruments are in it, what is the ...