Valve turned a puzzle game into one of the best electronic albums of 2011 and nobody blinked. The whole thing runs on procedural synths and generative textures that feel like a laboratory humming to itself. The Courtesy Call eases you back into Aperture with warm analog pads before everything starts falling apart.
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Ghost of Rattman is pure paranoia, all skittering beats and detuned piano. Turret Wife Serenade is absurdly beautiful for a song sung by a gun. Love as a Construct hits harder than any test chamber ever could. Then there's (defun botsbuildbots...)
, which is literally named in Lisp. If you played Portal 2 without headphones, you missed half the game.