More thoughts on improvising - I feel what creates the framework/foundation for fruitful improvisation with others is listening and sensing when not to play. Like Miles talking about the importance of empty spaces in an extrapolation, which he gleaned from Stockhousen. It's hard not to overplay because you don't have a set parameter, so it becomes an intuitive discipline to choose what you play, how you play, and when not to play - based on what is being played. It should result in a lively conversation between players and if overheard by an audience, should be engaging enough to hold their attention. Sorta like My Dinner With Andre.