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.
“It is extremely dangerous to talk about limits or borders. It is vital, instead, that we remain completely open, that we are always involved, and that we aim to contribute personally in social events.”
“We were totally unprepared for such a large quantity of visitors, and in view of the preservation of the antiquities they being very crowded and in poor preservation, we were obliged to refuse admission until some preparation was made to safeguard the objects.”