Lightning in a Bottle (20014)

The movie is a celebration of 100 years of the blues.  I guess in order to have a birthday you need to have a beginning, and I suspect htat there is more than a little controversy about exactly when it started and by whom.  Never mind.  It is fun to watch.
This is Martin Scorsese's love letter to the blues.  Being who he is, it is not nearly as brainiac as he describes it to be.  He over states what you will learn and understates what the experience of listening to the modern blues legends, some of them getting way up in years themselves (and quite a few of them gone now) celebrating the great blues songs, and the men and women who wrote them.
The thing is that it is more of a concert movie than it is a documentary.  There are little snippets of information about the legends, a short interview with someone about them, and then the lion's share of the time is the music.  Which is fine by me, but if you didn't know anything about the blues you might be more confused than educated by the end.