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6. 'California Gurls'
Perry’s answer to Jay Z and Alicia Keys’ “Empire State of Mind,” this tune became the summer anthem of 2010, no matter what state you lived in and enforced a return of the Daisy Dukes with bikinis on top dress code. Snoop Dogg’s rap helped propel the song to No. 1 on Billboard’s Hot 100, where it remained for six weeks. Three years later, it’s still so hot it will melt your popsicle.