metal riffs and psychedelic rock. The band described the album as a darker, sadder record. Kiedis's lyrics addressed drugs, including the lead single, "Warped", and broken relationships and deaths of loved ones, including "Tearjerker", written about Kurt Cobain. Despite mixed reviews, the album sold eight million copies worldwide and produced the band's third number-one single, "My Friends". The band also contributed to soundtracks including Working Class Hero: A Tribute to John Lennon and Beavis and Butt-Head Do America, and Flea and Navarro contributed to Alanis Morissette's single "You Oughta Know". The Chili Peppers began the tour for One Hot Minute in Europe in 1995. The US tour was postponed after Smith broke his wrist. In 1997, several shows were cancelled following deteriorating band relations, injuries, and Navarro and Kiedis's drug use. The band played three shows that year, including the first Fuji Rock Festival in Japan. In April 1998, the Chili Peppers announced that Navarro had left due to creative differences. Kiedis said the decision was mutual. Reports at the time indicated that Navarro's departure came after he attended a band practice under the influence of drugs. 1998–2001: Return of Frusciante and Californication With no guitarist, the Red Hot Chili Peppers were on the verge of breaking up. In the years following Frusciante's departure, his heroin addiction had left him in poverty and near death. Flea convinced Frusciante to enter Las Encinas Drug Rehabilitation Center in January 1998. His addiction left him with scarring on his arms, a restructured nose, and dental implants following an oral infection. In April 1998, Flea visited the recovered Frusciante and asked him to rejoin the band. Frusciante began sobbing and said nothing would make him happier. In June 1999, after more than a year of production, the Red Hot Chili Peppers released Californication, their seventh studio album. It sold over 16 million copies, and remains their most successful album. Californication contained fewer rap songs than its predecessors, instead integrating textured and melodic guitar riffs, vocals and basslines. It produced three number-one modern rock hits, "Scar Tissue", "Otherside" and "Californication". Californication received stronger reviews than One Hot Minute, and was a greater success worldwide. While many critics credited the success of the album to Frusciante's return, they also felt Kiedis's vocals had also improved. It was later listed at number 399 on the Rolling Stone magazine list of the 500 Greatest Albums of All Time.