Side projects (2004–2006)

Following Meteora's success, the band postponed working on a new studio album for the next few years. Instead, Linkin Park continued to tour and work on many side projects. Bennington appeared on DJ Lethal’s "State of the Art" and other work with Dead by Sunrise, while Shinoda did work with Depeche Mode. In 2004, the band began to work with Jay-Z to produce another remix album, entitled Collision Course. The album, which featured intermixed lyrics and background tracks from both artists' previous albums, debuted in November 2004. Shinoda also formed a new band, Fort Minor, as a side project. With the aid of Jay-Z, Fort Minor released its debut album, The Rising Tied, to critical acclaim. At the same time, the band's relationship with Warner Bros. Records was deteriorating rapidly on account of several trust and financial issues.After months of feuding, the band finally negotiated a deal in December 2005.

Linkin Park also participated in numerous charitable events, most notably raised money to benefit victims ofHurricane Charley in 2004 and later Hurricane Katrina in 2005. The band donated $75,000 to the Special Operations Warrior Foundation in March 2004. They also helped relief efforts for the 2004 Indian Ocean tsunami victims by staging several charity concerts and setting up an additional fund called "Music for Relief". Most notably, however, the band participated at Live 8, a series of charitable benefit concerts set up to raise global awareness. Alongside Jay-Z, the band performed on Live 8's stage in Philadelphia, Pennsylvania, to a global audience. The band would later be reunited with Jay-Z at the Grammy Award Ceremony 2006, during which they performed "Numb/Encore", en route to winning a Grammy for Best Rap/Sung Collaboration. They were joined on stage by Paul McCartney who added verses from the song "Yesterday". They would later go on to play at the 2006 Summer Sonic music festival, which was hosted by Metallica in Japan.