Prism is the fourth studio album by American singer Katy Perry, released by Capitol Records on October 18, 2013. While the album was initially planned to be “darker” than her previous material, Prism ultimately became a prominently dance-inspired record. The singer worked with several past collaborators, while enlisting new producers and guest vocals. Much of Prism revolves around the themes of living in the present, relationships, and self-empowerment. Critical response to Prism was generally mixed; many reviewers called the lyrical content mature, but also considered the album to be more formulaic than her previous material.