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“No, you will not hear a new theme for Batman,” Elfman said when asked about Justice League. “You’ll hear Batman’s theme for Batman.”
The interviewer asked Elfman if he was referring to Hans Zimmer’s score from the previous movie. “No,” Eflman said confidently. “You’ll hear Batman’s theme. Batman has only had one theme,” Eflman added before confirming that his classic 1989 Batman theme will be in Justice League. Check out Elfman’s answer in his own words in the video below.
From Batman News: