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Nightmare Fuel: Rush
"Red Sector A". It's based on Geddy's mother's experience as a Holocaust survivor, and it's just as nightmarish as you'd expect.
"WE HAVE ASSUMED CONTROL. WE HAVE ASSUMED CONTROL. WE HAVE ASSUMED CONTROL."
When you think about it, the entire concept of 2112 is nightmarish. A society in which the tyrannical government controls EVERYTHING and no one is allowed to be any different from anyone else and creativity is discouraged to the point that the government crushes a prodigy's beloved guitar to pieces beneath their feet right in front of him and drives him to suicide! Ditto BU2B, which sounds like your average "God isn't real" song, but when you think about it, is scary: a population brainwashed into believing that whatever happens is what's best for them no matter what. All is for the best, indeed.
"Cygnus X-1", a song about a space explorer sacrificing himself to a black hole. His success leads to arguably the pinnacle of Geddy's screaming; considering the events, these are screams of agony and pleasure all at the same time as "every nerve is...TORN APAAAART...". And that leaves just Alex's guitar and an ominous pulse fading out.