His contributions to American rock in the '60s as a cofounder of The Byrds and CSN are enduring and undeniable, even if his bonds with the collaborators he shares his legacy with have been sorely tested by friction and time. This lion-in-winter documentary portrait of music icon David Crosby-effusive about his craft and career, contemplative as a result of his late-life health challenges, still succumbing to the lure of the road, and self-aware of bridges burned-is a must-see for fans.