Even if you're improvising the fact that beforehand you know certain things will work helps you make those improvisations successful. It really helps to have a certain amount of knowledge about musical structure.
The knowledge that we have about what it is to be human that we have as a child is something we necessarily must lose.
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If I have enough ego to say I'm a writer a director a producer and an actor I should have the energy and the knowledge to write a scene for this great actor named Henry Fonda and direct him in it and have it work.