You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor, an actor, a car salesman or a captain of a starship. If you can bring truth and honesty to that character, then your audience will believe you.
It is curious how, from time immemorial, man seems to have associated the idea of evil with beauty, shrunk from it with a sort of ghostly fear, while, at the same time drawn to it by force of its hypnotic attraction.
Jazz is there and gone. It happens. You have to be present for it. That simple.

