Listen: Ariana Grande Previews New Single 'Problem'

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Listen: Ariana Grande Previews New Single 'Problem'

Katy Perry Portrays Party Entertainers in 'Birthday' Video Preview

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Katy Perry Portrays Party Entertainers in 'Birthday' Video Preview

iHeartRadio LIVE: Neon Trees

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iHeartRadio LIVE: Neon Trees

WATCH: Katy Perry plays 'Who Knows Katy' with fan on 'Kimmel'

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WATCH: Katy Perry plays 'Who Knows Katy' with fan on 'Kimmel'

POP PICS

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POP PICS

LISTEN: Tiesto releases new single featuring Matthew Koma 'Wasted'

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LISTEN: Tiesto releases new single featuring Matthew Koma 'Wasted'