Rating: B+ The purpose and importance of art and music is often debated. In a world where there are so many divisions, wars and hardships, what salve could music possibly provide? How does music and art in general connect people across cultures in ways that other means of communication cannot? , directed by Morgan Neville (who has helmed many other documentaries touching on music and art such as 2008’s The Cool School), explores some of these questions through the perspectives, lives and art of various musicians from around the world who have devoted their existence to their craft. While the …