2+2=5 by Radiohead

1. The lyrics are talking about things not being the way they should be and being trapped under authority.
2. The music sounds really mysterious and creepy which pushes things not being right. Also, when it says, "Don't question my authority," the tempo speeds up to push entrapment under this authority.
3. It's an allusion to 1984 because in the book it's said that if The Party told the people 2+2=5, they would believe it without any question.