The show is called American Epic, and it is very good, but since it is PBS I won't link to it. The Sessions episode is a couple of hours of top notch musical performances, including Taj Mahal and others.
On that show Taj talks about the awfulness of that flood and how Charlie was able to write about it with such rawness. That's the same flood that my family had to survive - I wish I knew more about how my grandfather saved his wife and sons - but then again, it might be better that I don't know the details.
The show about country music was interesting - Poor Valley is a real place and we owe a tremendous debt of gratitude to the people who lived there and took the risk to travel over to Bristol Tennessee to record their songs. This is one of them: