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Best Love Songs of the 21st Century
Katy Perry's 'Prism' Era Is More Impressive Than You Think: Here's Why
Top 10 Songs by Katy Perry - American Songwriter
Katy Perry Greatest Hits ~ Best Songs Music Hits Collection Top 10 Pop Artists of All Time
Katy Perry's biggest collaborations including Rita Ora and Snoop Dogg
Who is more successful in music, Taylor Swift or Katy Perry? - Quora
Easy as hey, B, C: how this euphoric yell took over pop music, Pop and rock
Katy Perry's New Album 'Witness' Is Purposeless Pop at Its Worst
Katy Perry Songs, Ranked: Worst to Best - GoldDerby
Behind the song: ''Roar'' by Katy Perry, roar song
Katy Perry and the End of Pop - The Atlantic
The 50 Best TV Shows Of The 21st Century So Far, Ranked – The Hollywood Reporter
FYI/TMI: Katy Perry, Alicia Keys, And Usher Among Inaugural Performers; Lady Gaga And Kelly Osbourne Face Off
Taylor Swift Is The 21st Century's Most Disorienting Pop Star : NPR
Best Katy Perry Songs: Tunes That Shaped 21st-Century Pop