The B-sides and cut content from Portal: Revolution, and honestly some of these unused tracks deserved to ship. "Laser Quartet, Red and Blue" layers competing melodic lines over puzzle tension. The music cubes (01 through 03) are playful little ambient toys, each one a self-contained sonic texture you'd want to find hidden in a test chamber.
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"Lunch at 10" has this oddly human, almost cafeteria-mundane quality that fits Aperture's corporate absurdity perfectly. The portal gun stingers hit with satisfying weight. "The Spire and Stirling" feels like a lost ambient piece that could have scored something memorable.
Jared Poolaw clearly had more ideas than the mod had room for. Worth hearing if Revolution's main score clicked with you.