Prism is the fourth studio album by American singer Katy Perry. It was released by Capitol Records on October 18, 2013. Although the album was initially planned to be "darker" than her previous material, Prism ultimately became a prominently dance-inspired record. Perry worked with several past collaborators, while enlisting new producers and guest vocals. Perry partially handled production with Dr. Luke, Max Martin, Stargate, Benny Blanco, Greg Wells, Cirkut, and others. The album includes a guest appearance from Juicy J of Three 6 Mafia. Much of Prism revolves around the themes of living in the present, relationships, and self-empowerment. The album received generally positive reviews; critics praised its lyrics for being more "mature" and personal, while others considered Prism more formulaic than her previous work.