20 Biggest Songs of the Summer: The 2010s (So Far)

European imports and Katy Perry dominate five years of summer

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Katy Perry, "Last Friday Night (T.G.I.F.)"

With "Last Friday Night," Katy Perry's Teenage Dream became only the second album in pop history to yield five Number One singles, after Michael Jackson's Bad. Perry loaded up the video with kitsch both old and new school, with cameos including Michael Bolton and YouTube star Rebecca Black.

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