Octotune is where Splatoon 2's music goes dark and it's incredible. The Octo Expansion soundtrack trades the main game's pop-punk energy for something moodier, with tracks numbered like test subjects and names like "#8 regret" and "#16 salty" that hit different when you know the story.
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"Nasty Majesty" is filthy in the best way, all distorted bass and attitude. The Deepsea Metro ambient tracks create this oppressive underground atmosphere that the series hadn't really touched before. Then "Fly Octo Fly" drops during the final escape sequence and suddenly you're tearing up over an Octoling on a helicopter.
The whole soundtrack builds toward that catharsis so deliberately. If you played Octo Expansion, you already know. If you didn't, just press play and find out.