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4. 'Hot n Cold'
One of Perry's signature hits that feels as fresh today as it did five years ago (and you can't say that for everything in her catalog) "Hot n Cold" is a high energy independence anthem where Katy just isn't gonna take it anymore. She sings, "I should know you're not gonna change" before telling him off in the film's catchy chorus. Another songwriter might have taken these lyrics and transformed "Hot n Cold" into a major downer, but instead Perry's wrapped it in an optimistic and irresistible dance beat. The more you listen to it, the more you realize it just isn't one of Perry's best songs, but it's one of the best pop songs of the '00s.
- Gregory Ellwood