Want to know more about "classical improvisation"? So do I. I will share my thoughts on the subject here, and hope it may provoke some responses. I saw German Bassist Peter Kowald play for half an hour solo at the CBGB basement improvisation series one evening I was playing with Assif Tsahar's NY Underground Orchestra. Peter had a rare ability to create a unity in his improvisation whereby from the very first note to the very last there was an overall form and structure. As I remember it, his form that night was ABCBA with A and B being contrasting themes with small developments, The C section was a merger of the A and B themes together, and he ended the work with a return to the original A theme in a pure form that began the work. This kind of cohesion is essential to a satisfying work of music in my estimation. I am always trying to see the big picture. There is no "filler" - no music you play to get to the "good stuff"- it must all be mined from the very first note. Each note, each articulation must work in the context of the whole piece.