Katy Perry's 'Dark Horse' ruling is the latest in music copyright infringement wars I Nightline

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:


ALSO AVAILABLE ON HULU:

#Nightline #KatyPerry #DarkHorse #JoyfulNoise #MarcusGray

Katy Perry,Dark Horse,Joyful Noise,copyright infringement wars,Marcus Gray,music,abc,abcnews,