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.

Random Quote

I went to engineering school which I thought was what I wanted to do for about two weeks. We had an orientation class and we met this guy where he worked and stuff and it was cool but I was like 'There is no way this is going to be my life.'