Don, I agree on the genres you mention. It has all evolved (or evolving into the same things). I use FL Studio as my DAW and will go into the forums and listen to the songs they post. All instrumentals. I call it electronica but they have 1500 different names for each song and it's 'still rock and roll to me.' The emphasis on all the songs it seems is the kick drum, the lead instrument. All songs seem to start with the kick. The sounds are different, and what they focus on, but when you get down to it nothing is different. No new chords. The riffs are no different, it just sounds different.

I've been listening to pop music the last few days (not rap pop). For all the difference in sounds (not that much really), to me, it is the same. It is melodic, nice chords and vocals. So for me music has not changed all that much over the years but the instrumentation has. And a lot of it I like. Lot of it I don't. But I felt the same in the 60s.

"The desire for fame is the last infirmity cast off even by the wise."
Cornelius Tacitus