Why do we like the music that we like? In pop music it was thought to be a generational thing. I'm applying that same theory to jazz, and it works out to a point. Beginning with "swing", which was before "Bird", he brought in "be-bop" which phased into "hard-bop" and what I call "modern jazz" that covers a lot of territory.
"Bird" was active from the 40's to 55 when he died. Most will agree, no one person made a greater change in jazz than Charlie Parker; since his time, jazz has branched out in different directions, all related to Charlie Parker, and morphed into what most people call "modern jazz". That has gone on through the 60's and into the 70's.
We did a side step with "fusion", but we went back to "modern jazz", which is pretty much a catch all category. I can't see where we have gone past "modern jazz"; somebody keeps talking about "free jazz" which sounds like "chaos" to me and a lot of other people; anyway, that "free jazz" never quite catches on, I know I have a lot of it I would like to sell if anyone is buying.
If there is some great movement after "modern jazz" that has eluded me, would someone please bring me up to date. I stated music and jazz was a generational thing, and I haven't gone anywhere in a fundamental sort of way for decades; am I stuck, or is jazz stuck?