“Only real difference is that the latest version of the so called rock music, RAP”
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I don’t know of anybody who designates rap as rock music. I think even on the charts, it’s called “urban contemporary” or the like, meaning “black music”. Used to be called “soul music”, before that “race music”.
No serious musicologist would confuse/conflate rap with rock. Two very different animals - you can drop elements of one into another (as Chicago blended jazz with rock) but they’re two different genres.
I don’t remember calling it rock, but calling it folk because it lacked a few of the pieces of actual music other than telling a story and having a steady rhythm beat. You mentioned Chicago. Blood Sweat and Tears, and Lighthouse were along with Chicago into the jazz/rock medium starting in the 60’s that transitioned from one to the other. But the original changes were coming from the gospel direction with people including Elvis. Bill Haley and the Comets were part of the transition in the late 50’s calling it rock and roll. And that term has been bent and reshaped many times since.
Most of the true big name jazz groups are gone now. The earlys starting with Glenn Miller, The Dorseys, Stan Kenton, Buddy Rich, Basie, Ellington, Cab, up to the last of them with Don Ellis, and Maynard Ferguson. A few of their groups remain in action, but limited. And many of the active ones have taken canned jobs to back TV shows and don’t tour anywhere near when they seemed like they were going nightly somewhere. Sad the changing times.
rwood