A jury will decide how much Perry owes Marcus Gray and two co-authors, who first sued Perry five years ago for copyright infringement, claiming she copied from their song, “Joyful Noise.” WATCH NIGHTLINE EPISODES: https://abc.go.com/shows/nightline ALSO AVAILABLE ON HULU: https://hulu.tv/2wSmSrZ #Nightline #KatyPerry #DarkHorse #JoyfulNoise #MarcusGray source

A protest in a Hong Kong train station quickly became violent after protesters attempted to block riot police from entering the station by creating barricades and spraying fire extinguishers. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news …

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