Katy Perry Drops 'Dark Horse' Ft. Juicy J

Katy Perry has released a new "Prism" track on iTunes. The track, which features guest vocal from Memphis rapper Juicy J, was produced by professional hitmakers Dr. Luke and Max Martin.

In a recent interview with MTV, Perry described the song as having a "witchy, spell-y kind of black magic-y idea." "And the lyrics are kind of witchy and dark, as if I was a witch warning this man not to fall in love with me, and if you do know I'm going to be your last," the 28-year-old singer explained.