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Tegan & Sara, 'Heartthrob'
Courtesy of Warner Brothers Records30/50

30. Tegan & Sara, 'Heartthrob'

After a decade-plus making smart folk pop, this duo of Canadian twins took a leap into radio-hungry dance beats. Their songwriting stayed sharp and revealing as ever, and on "Closer," they show up all the billion-dollar divas with a disco burner about "how to get you underneath me" that is one of the year's sweatiest singles.