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May
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What I especially objected to was a collective philosophy which excused all improvisation, however poor or unsuccessful, on the grounds that it was “risk-taking,” and therefore should never be criticized. But if criticism was disallowed, then the risks, it seemed to me, were only assumed by the audience, and not by the performers, whose philosophy gave them an automatic safety net. And, lacking self-criticism, they had neither the means nor the incentive to improve as improvisers, to benefit from what did and didn’t work and use the knowledge to push their art to a new level.
Some interesting thoughts on improvisation by Kyle Gann taken from his excellent blog, Postclassic