Takeshi Abo's score for Steins;Gate 0 carries this constant undercurrent of loss that the original never quite had. "Messenger" opens with piano that sounds like it's remembering something painful, setting up a whole album that lives in the space between hope and grief.
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"A Song Played by the Stars" is devastating in context, and the music box version twists the knife further. He even weaves in Mozart's Piano Sonata No. 11 as a narrative thread tied to the Amadeus AI, which is such a smart compositional choice.
The way tracks like "Isolation" and "Berserk" contrast the quieter moments keeps the tension coiled. If you played the original and skipped 0, this soundtrack alone will convince you to go back.