NEW YORK (AP) _ Jazz is more than a sophisticated form of music, says documentary filmmaker Ken Burns. It's a vehicle for studying history.

``Jazz is a precise prism through which so much of American history can be seen _ race, two world wars, a great depression, sex,'' said Burns, who has completed a 10-part series called ``Jazz'' for PBS.

The documentary, to be aired in January, contains more than 75 interviews and 498 pieces of music. Burns was at the Birdland jazz club Wednesday promoting the series.

``The simplest, most crowd-pleasing aspects of today's popular music has fast-food aspects,'' he said. ``To sit down and nourish ourselves in the best way at a meal, you can't help but find jazz.''