In 2004, Perry worked for the record production team The Matrix, who had previously worked with Avril Lavigne, Liz Phair, KoRn and Britney Spears, among others. Perry also began working on a debut mainstream album, writing with Glen Ballard, which was due for release in 2005; some of the collaborations included "Box" and "Diamonds," which were released on Perry's official MySpace page. Her burgeoning music career led to her being named "The Next Big Thing" in October 2004 in Blender Magazine, where Perry stated she wasn't "a typical Christian", mentioning that she had done "lots of bad things" during her adolescence. One of the tracks she recorded with Ballard, "Simple", was released on the soundtrack of the 2005 film The Sisterhood of the Traveling Pants. In 2006, Perry appeared on P.O.D.'s single, "Goodbye for Now". She has openly talked about her struggles within the music industry, such as being dropped from record labels for much of her early career. Her songs eventually captur