Warner Bros. has hired Danny Elfman to compose the score for this fall's Justice League, according to The Hollywood Reporter. This would be a return for Elfman, who scored both Batman and Batman Returns in the late 1980s and early 1990s.
Atonius Holkenborg (a.k.a. Junkie XL) had reportedly done preliminary work on the film's score with director Zack Snyder, but is said to be focused now on Tomb Raider.
Joss Whedon is currently shooting additional scenes for the film in London, and is scheduled to be overseeing the post-production of the film in place of Zack Snyder, who departed the film due to a family tragedy. Elfman worked with Whedon on 2015's Avengers: Age of Ultron, again picking up the work of another composer - in that case, Tyler Bates.