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

Orpheus10’s Grant Green clip illustrates perfectly both the obvious overlaps between Blues and Jazz and the problem and futility of attempts to make a strict distinction between the two genres. Not to mention that it answers beautifully his own question “Tell me what the two have in common?”. The answer, of course, is “a lot”.

What I mean is that I would be willing to wager my mint condition Muddy Waters records (or Miles records, your pick 😎) that at least half of all listeners, if asked whether that clip is Blues or Jazz without knowing the title, would say “Jazz”.

Nice clip.

I don't suppose everyone is old enough to remember "radio"; meaning what we listened to for entertainment because few people had TV.

I was a child myself, so that was a long time ago. Blues was "Delta Blues" and jazz was Charlie Parker, Dizzy, Sonny Stitt, and the most prominent jazz musicians. They came on "one" radio station only, along with Gospel on Sunday. That's how they came to be lumped together.

That was the answer to the question almost 70 years ago. Does an answer to a question that's 70 years old count?

**** They came on "one" radio station only, along with Gospel on Sunday. That’s how they came to be lumped together. ****

That may very well be how they came to be lumped together, but there is a reason for WHY they were lumped together. Because Jazz, Blues and Gospel all come from the same place (metaphorically speaking); they have much in common so are likely to appeal to the same listener base. After all, why not Classical on Sunday instead?Polka on Monday and Tuesday is just as bad 😉.

Two left ears:

I don’t really know whether your comment about jazz and blues is meant to be sardonic. 
Please see

http://www.gregtivis.com/articles/Jazz-and-Blues.php

for starters.