Christopher Nolan's World War II epic Dunkirk showcases the best and worst of the director's tendencies.
And he was just like this. Talented, enthusiastic, expert, willing to share, with a special empathy for music. With him it was very personal. He just plain looked happy while playing. He was at the center of that whole Campus Folk Song Club matrix at the University of Illinois in the early 1960s, which was the creation of the famous folklorist and labor historian Archie Green. It's hard to explain about the club. You had to have been there. Maybe just listening to Andy is one way to know.
Here is Andy Cohen's website.