Their music lifted the nation's spirits during the darkest days of the Depression. Their lyrics captured the joys and tragedies of everyday life: loves won and lost, dreams attained and shattered, separations and reunions. Their original sound, first heard 75 years ago in a makeshift recording studio in Bristol, Tenn., laid the foundations for American folk, country, and bluegrass music.

This hour-long documentary by Emmy Award-winning producer Kathy Conkwright explores the lives of A.P., Sara and Maybelle Carter , starting with their childhood in Poor Valley, Virginia, and following their story through the early 1940s, when they stopped playing and recording together. The film features rarely seen family photographs, memorabilia, and archival footage that chronicles the life and music of this famous and influential trio. Robert Duvall narrates.