I just watched the American Masters show on PBS featuring Joan Baez who has been active in show business for 50 years. Most documentaries show only the professional life of the subject but this featured the public and private sides of Joan. It showed concert performances from the early and later parts of her career. There were comments by Bob Dylan, David Crosby and Roger Mcguinn among others. She reunited with her ex-husband David Harris who was in prison for evading the draft during their marriage. If you remember Joan was pregnant when she performed at Woodstock. Her son Gabriel now 40 years old appeared in this documentary. My favorite part was the clips they showed of her performing with Bob Dylan during the Rolling Thuder Revue in the mid 1970s.
The clip above (Youtube video) was from the Rolling Thunder Revue, at Fort Collins, Colorado, 23 May 1976, Bob Dylan & Joan Baez perform the Woody Guthrie song Deportee (aka Plane Wreck at Los Gatos).
For more information about the American Masters show please see http://www.pbs.org/wnet/americanmasters/episodes/joan-baez/how-sweet-the-sound/1185/