Jazz is not Blues and Blues is not Jazz.......

Overlap would be in the ears and thoughts of the listener. And if people want to think of Blues/Jazz like Country/Rock or Military/Intelligence that is their right. 

How's this, Country Western, Rock and Roll, Blues and Jazz were ALL born in the USA. They are bound to cross a few boundaries.
Wrong country for being a purest, ay?

If you think about it, one was born from the another, or branched and taken from another. It's not like Opera, Dixieland jazz, Bali, or Bagpipes, crossing lines... Just sayin, more alike than not...

Regards

Whatjd, you have to be a little more specific, we seem to have too many different kind of "Blues's"; Delta Blues, country Blues, chicken little blues, Gumbo Blues, and I don't know what else; you see my point.

I'm 100% on your side because I have never liked "Delta Blues" and in no way should it be included with jazz.

However, here is where confusion arises; one of my favorite tunes is "Sandra's Blues"; I knew Sandra, and I remember when she got the Blues, it was because of that no count man she was foolin around with; but Sandra didn't like Blues she was strictly into jazz, the same as the artists who are playing this tune.


            https://www.youtube.com/watch?v=VhgUUe5czxc


Maybe you could clarify that bit of confusion.

When it comes to music "Google" is out to lunch;


    http://www.screamingbluedogs.com/index.php/the-different-types-of-blues-music/

Overlap:

Anyone who doesn’t understand that had there been no blues there would be no Jazz, well.......