Rock documentaries made by fans of the band fall into two categories: They either exclude nonbelievers or draw them into the fold. "Pearl Jam Twenty" starts out exclusionary but opens the gates before it's through. Writer-director Cameron Crowe, whose idea it was to examine the celebrated Seattle-based band in time for its 20th anniversary, is no ordinary fan. His films include "Jerry Maguire" and "Almost Famous," and he has the Matt Damon-starring "We Bought a Zoo" due for December release.
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