Coming for Katy Like a Dark Horse: Copyright Law in the U.S.World-renowned pop singer Katy Perry was recently dealt a crushing blow when a jury found that her song “Dark Horse” had copied the work of gospel rapper Marcus Gray. The infringed song, “Joyful Noise,” was said to have an identical beat to “Dark Horse” in terms of length, rhythm, and pitch. Ultimately, the jury decided that Perry’s team had copied “Joyful Noise,” and Gray should be awarded $2.78 million, 22.5% of “Dark Horse” profits. The decision has left musicians and songwriters reeling.