Katy Perry's 'Roar' knocks 'Blurred Lines' out of No. 1 spot
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Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100 – Billboard, roar song
Official Chart Flashback 2013: Katy Perry's Roar lets the light in
Katy Perry: Rise released to celebrate 2016 Rio Olympics
Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100
Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100 – Billboard, roar song
Katy Perry's 'Roar' tops U.S. record chart
Katy Perry On The 180 That Saved Her Career : NPR