May 18th - Ariana Grande, Justin Bieber Top Hot 100, Katy Perry's TV Debut of "Daisies" & New Releases From Harry Styles, Taylor Swift

Ariana Grande and Justin Bieber hit No. 1 on the Billboard Hot 100, Katy Perry debuts "Daisies" on the night an 'Idol' winner is crowned and new releases from Harry Styles and Taylor Swift. This is Billboard News Now, rounding out the top news stories in music for Monday, May 18th. 

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