Before I gaze at you again If ever I would leave you I loved you once in silence Mein Herr I know him so well Potiphar Madamoiselle in New Rochelle I'll never be jealous again Mamma Mia I had myself a true love Only with you
These ones are a bit less relevant, but could still fit if you're willing to include vicarious cheaters, flirts, serial romancers etc:
To keep my love alive Someone to watch over me (if played in a sleazy way) Have i got a girl for you When I'm not near the girl I love Where is the life that late I led Take me or leave me I'm a bad, bad man Everybody ought to have a maid
>> "Well, to be fair to all who replied, I think there are a lot more Broadway songs about adulterous cheating than test-taking cheating."
Exploring the vein of non-adulterous cheating: * Lucy cheats in The Book Report by superfluously listing vegetables and the word, "very". You're A Good Man Charlie Brown * Dirty Rotten NumberDirty Rotten Scoundrels * You've Got To Pick A Pocket or TwoOliver * TroubleThe Music Man * There's A Sucker Born Every MinuteBarnum * Samovar the LawyerA Day In Hollywood/A Night in the Ukraine * Don't Break The RulesCatch Me If You Can * One Jump AheadAladdin * Master of the HouseLes Misérables