You’ve been there at some point. We all have. Whether you plan something really far in advance (maybe in your younger/development stages) or on the bandstand in the heat of the moment; we’ve all been there.
So why does your improvisation never (or at least many times) work out the way you plan? Because the nature of improvisation is creation in the moment. Music is fickle. If you try to force something out it does not come out the way you wanted it. I like one of the definitions of improvisation found on Wikipedia that doesn’t get talked about much in musical circles: “adapting a device for some use other than that which it was designed for.” Think about that in a musical context. That idea you worked on in the woodshed…adapt it for something else you weren’t planning. For many musicians that is a scary thought. We like to plan and prepare because we don’t like making mistakes or the fear of failure. But, I believe some of the greatest improvisers do this. At some point they let go and adapt.
How does this look for us? Well, I suggest you still plan and prepare.
“Wait, didn’t you just say that never works?”
Yes, but in the application. That’s where it matters most. You still need to make time to plan what you need to work on (maybe you still struggle with chromatic targeting, the blues, or minor lines) and prepare by practicing what you are not good at yet. Then take those plans and be prepared to adapt them. Have command over your ideas so you can place them anywhere. Do this and you are well on the path of becoming a great improviser!
(If you need some help with those plans be sure to browse around my site or check out my books HERE)