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Katy Perry credits sharks for Super Bowl halftime show - Sports Illustrated
Super Bowl XLIX Halftime Show Starring Katy Perry (TV Special 2015) - IMDb
Why did Taylor Swift decline the opportunity to perform at the Super Bowl halftime gig, considering her busy schedule with the 'Eras Tour'? - Quora
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Katy Perry's choreographer from Grand Rapids says 'Left Shark' nailed it at Super Bowl
Super Bowl XLIX Halftime Left Shark
Katy Perry's Left Shark: Here's the True Story
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Katy Perry's 5 New Super Bowl Halftime Show Revelations