When did musicians become as profitable as superheroes at the box-office

Guardian asks why all the movies with/about musicians this year, and last. It's been a handful: 'A Star Is Born' about fictional Ally, 'Bohemian Rhapsody' about pretty much real Freddie Mercury, 'Will Rose' about a woman out of prison and in the country music, 'Vox Lux' about a fictional star Celeste, 'Beats' about stupid law against rave culture. 'Rocketman' is fresh from Cannes, and still to come are 'Yesterday' about what would life be like without Beatles, 'Judy' with Renée Zellweger as Judy Garland, 'Blinded By the Light' about s Bruce Springsteen fan.