David N. Bossie, the president of Citizen's United, told the Times that the music in question was not by Glass but by a different composer, Walter Heinisch, and that it was used with permission. Bossie added that he suspected that Glass, who contributed music to a film about Democratic presidential nominee John Kerry, was driven to file suit by political ideology.

Glass's lawyer, Timothy O'Donnell, said that Glass was entitled to decide how his music was used. "Philip Glass is passionately opposed to the agenda of this partisan organization and he does not want his music used to promote that agenda," he said.

O'Donnell said that if Glass's music is in the film itself, he would consider asking a judge to prevent it from being shown.