F4Movies reports that John Ottman will return to compose the music for Fantastic Four and The Silver Surfer, but he won’t be editing as well:
“It’s always been a fantasy of mine to follow up something I’ve previously scored with a sequel, so I’m excited about it. I can’t say that the themes were intentionally designed to be expanded upon later, but it’s something I hope to do. I like now that the characters are established I can have fun with them.”
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Source: JMAFan