Documentary is an indictment of society rather than of Amy Winehouse’s life

There are no individual villains in Asif Kapadia’s mesmerising, moving docu-collage. Just a heroine — a funny, gobby, clever, common girl brimming over with a volcano of talent, but who only ever wanted to be a jazz singer, writing songs about heartbreak for small audiences in darkened jazz clubs. She never, ever wanted fame.