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17. Rihanna: "Umbrella"
"Umbrella" was a phenomenon for two reasons: 1) the song never, ever gets old; 2) Rihanna's endlessly sultry vocal launched her into superstardom. This is Rihanna's "Toxic," the song that verified she has a specific, implacable niche in the pop stratosphere. The video is a shower of glitz and sexuality, with Rihanna towering over us as a leathery, lacquered-up Mary Poppins.