Can singing change history? The Singing Revolution," a documentary by James Tusty and Maureen Castle Tusty about Estonia's struggle to end Soviet occupation, shows that it already has. The first part of "Revolution" provides a thumbnail sketch of 20th-century Estonian history, and it's not pretty. This small nation was a satellite state of the former Soviet Union for much of that time, except for a brief period when the Germans controlled it. Under the Soviets, especially, Estonian culture was brutishly suppressed, but it welled up every five years in July, when Estonians gathered in Tallinn for the Estonian song festival, which often drew upward of 25,000 people. The images of these festivals are moving already; the force of the singers and the precision of their conductors are stunning to behold. But the emotion swells further when Estonians defy their occupiers by singing nationalist songs. This bold act reclaimed Estonian identity and set the stage for a series of increasingly daring rebellions under the Soviet President Mikhail S. Gorbachev, who advocated glasnost and got more than he bargained for. Imagine the scene in "Casablanca" in which the French patrons sing "La Marseillaise" in defiance of the Germans, then multiply its power by a factor of thousands, and you've only begun to imagine the force of "The Singing Revolution."

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