Prism is the fourth studio album by American singer Katy Perry. While 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. Much of Prism revolves around the themes of living in the present, relationships, and self-empowerment. The album garnered generally positive reviews with critics praising its lyrics for being more "mature" and personal, while others considered Prism to be more formulaic than her previous material