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"Visitors From Dreams", the first song on the OST, plays in the intro, where the camera swoops around a representation of the Internet, or at least, a local network. The combination of the music and the Retraux graphics really makes it a memorable scene.
"Pain Slide Down", the credits song, is a bittersweet song for a bittersweet ending. This is amplified by the Darwinians bringing in the letters of the credits.