Prism is the fourth studio album by singer Katy Perry which was released worldwide on October 22. Perry spent a lot of time recording this album in Sweden, which is the base of inspiration for the record. This album received mostly positive reviews and sold 286,000 copies in its first week. This is her best opening week out of all of her albums. Two well-known singles from this album include “Roar” which was released as a single on August 10 and topped the Billboard charts. Her second single, “Unconditionally”, was released on October 16.