Justice League opens with a rather dour montage, exploring the fallout of the death of Superman in Batman v.
Justice League‘s opening credits song was one of the additions that Joss Whedon made to the film, according to Whedon himself.
The finished product of Justice League does feel a bit at odds with itself, as some things about the film are undeniably and unquestionably Joss Whedon.
However, the specific use of music in Justice League was one of the brand-new elements of the movie and universe.