Chet Baker was a leading jazz musician in the 1950s, playing trumpet and providing vocals. Baker died in 1988, yet he is about to add a new claim to fame as the lead plaintiff in possibly the largest copyright infringement case in Canadian history. His estate, which still owns the copyright in more than 50 of his works, is part of a massive class-action lawsuit that has been underway for the past year.

The infringer has effectively already admitted owing at least $50 million and the full claim could exceed $6 billion. If the dollars don't shock, the target of the lawsuit undoubtedly will: The defendants in the case are Warner Music Canada, Sony BMG Music Canada, EMI Music Canada, and Universal Music Canada, the four primary members of the Canadian Recording Industry Association.

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The class action seeks the option of statutory damages for each infringement. At $20,000 per infringement, potential liability exceeds $6 billion.

These numbers may sound outrageous, yet they are based on the same rules that led the recording industry to claim a single file sharer is liable for millions in damages.

HOUSTON — President Obama’s plan to deliver a speech to public school students on Tuesday has set off a revolt among conservative parents, who have accused the president of trying to indoctrinate their children with socialist ideas and are asking school officials to excuse the children from listening.

The uproar over the speech, in which Mr. Obama intends to urge students to work hard and stay in school, has been particularly acute in Texas, where several major school districts, under pressure from parents, have laid plans to let children opt out of lending the president an ear.

Some parents said they were concerned because the speech had not been screened for political content. Nor, they said, had it been reviewed by the State Board of Education and local school boards, which, under state law, must approve the curriculum.

“The thing that concerned me most about it was it seemed like a direct channel from the president of the United States into the classroom, to my child,” said Brett Curtis, an engineer from Pearland, Tex., who said he would keep his three children home.

“I don’t want our schools turned over to some socialist movement.”