F rom creating the Guardians of the Galaxy franchise’s mixtapes to making the obscure Iggy Pop/Teddybears nugget “Punkrocker” one of the songs of the summer via Superman , DC Studios co-CEO James Gunn has an impeccable record when it comes to mixing music with superhero universes. Peacemaker ‘s just-concluded second season, with its killer Foxy Shazam theme song (“Oh Lord”) and its finale performances by both Foxy and the long-haired rock band Nelson (playing the very deep cut “To Get Back to