Ya know....

I'm not embarrassed to say that I don't know what "collective improvisation" is...

I know what collective means..and I know what improvisation means...but together as a phrase...I dunno...

I do know that improvisation as an accepted form goes back hundreds of years....
One of Mozarts particular abilities was to improvise performances based on the themes of others....

Gotta be careful with Jazzers...
I been clobbered with Be-Bop attitudes many times for daring to tell the truth.

Jazz is like Picasso.....some good stuff...and lots of Bull---- !

Bob