For some 30 years, they embodied "country blues" for folk music audiences around the globe. Sonny Terry and Brownie McGhee were once ubiquitous, and as such tended to be taken for granted in the halcyon days of the 1960s blues rediscoveries. But nearly two decades have passed since the perennial team parted, and the 16 performances here remind us of this superb duo's complementary strengths.

Black and white footage of performances, interviews, and conversations at the Newport Folk Festival, from 1963 to 1966. The headliners are Peter, Paul and Mary, Joan Baez, Pete Seeger, and Bob Dylan, who's acoustic and electric. Son House and Mike Bloomfield talk about the blues; John Hurt, Howlin' Wolf, and Sonny Terry and Brownie McGhee show its range. The Osborne Brothers perform bluegrass. Donovan, Johnny Cash, Judy Collins, Mimi and Dick Farina, and others less well known also perform. Several talk musical philosophy, and there's a running commentary about the nature and appeal of folk music. The crowd looks clean cut.

A down-and-out Brooklyn detective is hired to track down a singer on an odyssey that will take him through the desperate streets of Harlem, the smoke-filled jazz clubs of New Orleans, and the swamps of Louisiana and its seedy underworld of voodoo.