In the late '40s, Folkways Records changed American culture, opening ears to the Anglo-American folk music and blues of Woodie Guthrie and Leadbelly. Almost 50 years later, the label is still in the business of alerting this country to its own sounds, including Heartbeat: Voices of First Nations Women, a disc of modern music by Native American women. From rough-hewn traditional chants to sleek folk-pop, Heartbeat's a majestic offering. A

