In Jazz, improvisation isn't a matter of just making any ol' thing up. Jazz, like any language, has its own grammer and vocabulary. There's no right or wrong, just some choices that are better than others.
Wynton MarsalisWhen me and my brother would go to see our daddy playing, there'd be 30 people in the audience. I was only 14 or 15, but I realised something was wrong.
Wynton Marsalis