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[video=youtube]
Writer(s)
Katy Perry, Lukasz Gottwald, Max Martin, Bonnie McKee, Henry Walter
Producer(s)
Dr. Luke, Max Martin, Cirkut
http://img.aceshowbiz.com/images/news/katy-perry-reveals-flowery-artwork-for-unconditionally.jpg[/img]
[video=youtube]
Writer(s)
Katy Perry, Lukasz Gottwald, Max Martin, Henry Walter
Producer(s)
Dr. Luke, Max Martin, Cirkut
http://c.directlyrics.com/img/upload/katy-perry-dark-horse-single-cover.jpg[/img]
[video=youtube]
Writer(s)
Katy Perry, Jordan Houston, Lukasz Gottwald, Sarah Theresa Hudson, Max Martin, Henry Walter
Producer(s)
Dr. Luke, Max Martin, Cirkut
http://vignette2.wikia.nocookie.net/katyperry/images/e/e2/Katyperrybirthdayuncensored.jpg/revision/latest?cb=20140404014824[/img]
[video=youtube]
Writer(s)
Katy Perry, Lukasz Gottwald, Max Martin, Bonnie McKee, Henry Walter
Producer(s)
Dr. Luke, Max Martin, Cirkut
http://www.josepvinaixa.com/blog/wp-content/uploads/2014/08/Katy-Perry-This-Is-How-We-Do-2014-Official-1000x1000.png[/img]
[video=youtube]
Writer(s)
Katy Perry, Klas Åhlund, Max Martin
Producer(s)
Klas Åhlund, Max Martin
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