It's perfectly reasonable to wonder why anybody feels the need for another documentary about Woodstock. We've already got the film of the same name that was released in 1970, a staggering 224 minutes of dope, drizzle, and dishabille, which won an Oscar and is part of the Library of Congress' National Film Registry.

But there are a few reasons you might want to take a peek at PBS's new effort, Woodstock: Three Days That Defined a Generation. For instance, its revelation of the novel funding idea of Artie Kornfeld, one of 1969 rock festival's principal organizers.

Told that construction crews hadn't been able to get fences built in time and Woodstock would have to be declared a free concert, Kornfeld asked: "Can't we get a whole bunch of girls and put them in diaphanous gowns and give them collection baskets and send them out into the audience?"

Then there's the video of that bumper sticker posted on one of the food stands that dotted the perimeter of the concert ground: "DON'T WORRY BE HAPPY," a full 19 years before Bobby McFerrin's record drove a nation to homicidal madness.