Three of Valve's best games on one disc and the music holds up absurdly well. The Orange Box bundles Half-Life 2 episodes, Portal, and TF2, and each score has completely different DNA. "Still Alive" by Jonathan Coulton is obviously iconic at this point, GLaDOS singing you a passive-aggressive breakup song over credits.
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But "Vortal Combat" goes so much harder than people remember, this driving industrial tension that makes antlion fights feel desperate. "Rocket Jump Waltz" from TF2 is genuinely elegant, a waltz that somehow fits a cartoon war game.
Then there's "Sector Sweep" with that cold, synthetic paranoia that only Half-Life does right. If you grew up on Valve games and never just sat with this music, fix that.