Yeah, improvising only really works 100% when you're with somebody.
No, improvising is wonderful. But, the thing is that you cannot improvise unless you know exactly what you're doing.
Improvising things is always changing. A lot of momentum.
There's something very edgy about Bill Murray out there improvising.
That's what improvising is like for me. There's no tollbooth between my impulse and my action.
I'm improvising all the time. Everything I do is improvised. On the piano, at least.