Band/artist documentaries.

If it hasn't been suggested yet I would recommend the PBS documentary "Introducing Roy Buchanan" (also referred to as "The Greatest Unknown Guitar Player in the World")

I was planning to see Roy play a free outdoor show in Guilford, CT when I learned a day or two before the show that he had hung himself in jail. Such a loss.

Since Ken Burns' Country Music is mentioned, I'll add Ken Burns' Jazz documentary. Another one I just remembered is Louie Bluie. It's about Howard Armstrong, who was a member of the Black American string band, Martin, Bogen and the Armstrongs. It was directed by bdp24's friend Terry Zwigoff.

https://www.youtube.com/watch?v=1Qv9HEc2-EE

I agree with every post on here...a first! One outstanding film that is missing is 

Chuck Leavell: Tree Man

You can watch it on YouTube for free now. He's written some of the best, most recognizable keyboard solos in modern music history Check it out:

Check Leavell: Tree Man

Beyond the Lighted Stage - Rush

Jaco - Jaco Pastorius

Lemmy - Lemmy Kilmister

+1 Lemmy