Mr. Platt, a former senior executive at Universal (and the father of Ben Platt, star of the hit stage production “Dear Evan Hansen”), has in many ways become Hollywood’s go-to producer of movie musicals. In 2014, he shepherded Disney’s adaptation of the Stephen Sondheim musical “Into the Woods,” which took in $213 million worldwide. As a major force behind “Wicked” on Broadway, Mr. Platt is working with Stephen Daldry (who directed the film version of “Billy Elliot”) to bring a movie version to theaters in 2019.

“Yes, still on track,” Mr. Platt said of that long-gestating project.

Nothing fuels a Hollywood boom (or a boomlet, as the case may be with musicals) like a track record of success. And some studio executives said that they were becoming more open to musicals because the animated variety had experienced such a renaissance. “Frozen” was a monster hit, selling $1.3 billion in tickets worldwide. Over the past few months, three animated musicals — “Sing,” “Moana” and “Trolls” — have taken in a combined $1 billion at the global box office. Disney will release a singalong version of “Moana” (with lyrics on the screen, karaoke style) on Jan. 27.

Some studios have also had recent success with pseudo-musicals, including films like “Pitch Perfect” that rely on pop hits and mostly keep the singing to stage settings. Television may also be giving film executives confidence; specials like “The Wiz Live!” and “Grease: Live” have reintroduced break-into-song entertainment to a mass audience.