There are no rules. You can make a musical about absolutely anything. Brexit, JeremyCorbyn and Gwyneth Paltrow’s ski trial have all had the treatment recently. Just tell ’em to burst into song, right?
However, a Spanish-language musical directed by a Frenchman, a gender reassignment story made by a straight guy, and set in the milieu of Mexican drug cartels has got the alarm bells firing off all at once. But somehow, Jacques Audiard has totally pulled off what could have been (after the misadventure of Joker: Folie à Deux) this month’s second musical, er, folly.