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Certain kinds of speed flow, intensity, density of attacks, density of interaction... Music that concentrates on those qualities is, I think, easier achieved by free improvisation between people sharing a common attitude, a common language.
I always laugh the hardest at the stuff you see in day-to-day life. It's great when somebody can tell a joke that really makes you laugh hard, but to see some kind of personal interaction that no one could write is so good. Those are always the things that make me laugh.