Also, "Soundtrack" refers to songs that have licensed and appear throughout the film.
Sometimes, the released soundtracks include music that wasn't even heard in the movie but are in the "spirit" of the film (In other words, an easy way to promote and expose "baby bands" that are "forced" upon the film makers by the studio in order to earn more money for their music division).
"Score" is the accurate term to describe the music composed specifically for the film. On this case, John Williams composed the score for Superman.
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