I think it was pretty clear what you meant by form and message, which you've restated here as if these basic terms weren't understood.
"Message is what idea the artist is trying to communicate"
What if what they are trying to communicate is irrelevant? Pointless? Self-referential? Mundane?
All art doesn't get a free pass simply because it is "art."
I'm sorry, just you saying '"message" (content)' made me think I was being misunderstood as by message I did not mean the content of the artwork.
Well, it makes it bad art doesn't it? But just because it is not trying to communicate some deep philosophical meaning, why should Jazz be discarded? Thats not what its trying to do, so why should it be judged on the same criterion as the so called "structured" music such as Classical and Black Metal?
Anyway, I've been looking at starting to listen to Dave Brubeck, Edrihan, or anyone else, do you have an suggestions on what album(s) should I start on and any other artists I may like?