How do you profile someone who wants to remain a mystery? Oscar-winning documentarian Morgan Neville has made a number of different types of nonfiction movies, from anatomies of art and music scenes to political history lessons. But the 20 Feet From Stardom filmmaker is probably best known for his portraits of artists who can sometimes be difficult, enigmatic, reluctant to open up and often hard to pin down. Neville has done feature-length profiles on Keith Richards (2015’s Keith Richards: