Back in February the above tweet surfaced online drawing comparisons between Superman’s theme from Man of Steel (which carried into Batman V Superman) and Lex Luthor’s Dawn of Justice theme music.
Although this tweet has been online since February, Batman V Superman’s composer, Junkie XL, recently retweeted it, which seems to potentially validate it.
The theory notes that the musical cues for these two characters utilize similar instruments and note structures, but Lex Luthor’s theme is “warped” to make the music sound more menacing and hopeless.