Kelly Bailey and Mike Morasky built a soundtrack that sounds like a sterile lab slowly losing its mind. The early test chamber tracks are all cold ambient hums and clinical synth tones, but as GLaDOS unravels, so does the music.
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"Android Hell" is this soaring, unsettling ambient synth piece that makes your skin crawl in the best way. "Procedural Jiggle Bone" wobbles with this eerie mechanical energy. "Self Esteem Fund" just sits there radiating quiet menace.
And then "Still Alive" kicks in during the credits and completely reframes everything you just heard as dark comedy. A masterclass in Source Engine audio design that still holds up almost two decades later. Play it to remember when Valve made games.