Californication is the seventh studio album by Red Hot Chili Peppers. It was originally released on June 8, 1999. The album was produced by Rick Rubin. Californication marked the return of John Frusciante, who had previously appeared on Mother's Milk and Blood Sugar Sex Magik, to replace Dave Navarro as the band's guitarist. Frusciante's return was credited with changing the band's sound altogether, producing a notable shift in style from the music recorded with Navarro. The album's subject material incorporated various sexual innuendos commonly associated with the band, but also contained more varied themes than previous outings, including death, contemplations of suicide, California, drugs, globalization, and travel. Californication is the Chili Peppers' most commercially successful studio release internationally, with over 15 million copies sold worldwide.