The director turned to John Murphy, who composed the scores for Gunn’s 2021 DC film “The Suicide Squad” and his 2023 Marvel film “Guardians of the Galaxy Vol. 3.” “I said, ‘I want to use a version of the Williams theme, but I want to do our own version of it,’” Gunn said. “That leads into a lot of other pieces, some of which harken back to the Williams theme, but some of which are purely John Murphy.”
The director brought Murphy in at the very start of the process — a rare early appointment for film composers — sending him preliminary drafts of the screenplay nearly two years ago. Gunn then played some of Murphy’s initial passes at a score on the set while they were shooting the film. “It’s finding that balance between the novel and the traditional.”