A cautionary tale for composers? Arty (DJ Artem Stoliarov) is suing Marshmello whose biggest hit, “Happier,” in Arty’s view infringes on a work of his called “I Lived (Arty Remix).) There’s a Musicologize article about the question of similarity between “Happier,” and “I Lived (Arty Remix)” which is a remix of One Republic’s “I Lived.” …