I'd never heard of Jaco, or Jamerson, until probably Scott Devine mentioned them in his YouTube videos that I watched, maybe 3-4 years ago. And Charles Mingus, I had to look him up just now
It's just that where and when I grew up, and the kind of music that exposed me too, those guys were
so far out side of that .... Jamerson would be the only one I'd even heard in passing. Even Entwistle....I'd heard a couple of The Who songs, but only what played on the radio by the late 80s, and I didn't know him by name until probably the last decade or so.
I didn't get into music at all before the mid 80s, when I was able to move to stay with my dad, and as a new teenager, if it wasn't some kind of rock or metal, I didn't have much to do with it until probably the late 90s? I guess. Then it was country & alternative rock for a while, then (modern) rock & metal.
Then I started hanging out with you guys
So now I've heard of those guys, and listened to some of their music, but really not my cup of tea for the most part....