I guess it depends if you are in a concert or a dance gig situation...

I'm sure Wynton didn't interrupt the dance floor (back when he MIGHT have been playing dance gigs!) to give a short lecture on Jazz History!

I just figure, if you are in a jazz club situation, the audience probably knows as much as you do, and really would prefer to hear music rather than a dissertation Me, I tend to feel trying to 'teach' the masses at a dance gig like the old saying... "Never try to teach a pig to sing- it wastes your time and annoys the pig"