"On the other hand, all onstage jazz impro's were tried out before in rehearsal. There are very few musicians who do free-impro, total on-the-spot improvisation, onstage."
Not knowing precisely what Ernesto means by "free-improv" or "total on-the-spot improvisation" I am still dubious about this statement. I can say from experience that here (USA) jazz musicians consistently improvise their choruses without having rehearsed them beforehand, whether on stage, in a club, or just in a session. And given any familiar tune, the standard chord changes may be altered and improvised upon without rehearsal. This is simply the most basic aspect of jazz, and is what any jazz musician does. Ned To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
