in 2004 created an "epiphany" within the musician to change the world. During its brief hiatus in 2002, DeLonge suffered a
herniated disc in his back and collected several darker musical ideas he viewed unsuitable for the band; the ideas were used in supergroup
Box Car Racer's
self-titled album, recorded with assistance from
Hazen Street guitarist and longtime friend David Kennedy. Box Car Racer was intended as a one-time experimental project, but it evolved into a full-fledged band involving Barker. The side project would cause personal conflicts between DeLonge and Hoppus; the latter was not a member of the supergroup and felt betrayed. After the success of
Box Car Racer, DeLonge declined a solo recording deal offered by
Geffen Records because he believed it would cast negative light on Blink-182, but it loomed over the band in addition to growing internal tension. He eventually expressed his desire to take a half-year respite from touring to spend more time with family matters, a decision that Hoppus and Barker asserted was a lengthy interruption. DeLonge did not blame his bandmates for disappointment with his requests, but was dismayed that they apparently could not understand them. Blink-182 agreed to perform at
Music for Relief's Concert for South Asia, a benefit show to aid victims of the
2004 Indian Ocean earthquake, but further arguments that ensued during rehearsals rooted in the band members' increasing paranoia and bitterness toward each other. DeLonge judged the band's priorities to be "mad, mad different" and claimed that they had simply grown apart as they aged. This communication breakdown led to heated exchanges resulting in his departure from the group, which Geffen announced on February 22, 2005, would be going on an "indefinite hiatus", and he would not speak to Barker or Hoppus for several years, although he called the latter his greatest friend. The background of Angels & Airwaves was based on DeLonge's endorsement of
John Kerry in the
2004 presidential election, travelling the political circuit with the Democratic Party candidate; DeLonge was inspired by Kerry's need for widespread reform and likened his presidential campaign to a drug, remarking later that it "really changed [me]." He rediscovered the epiphany developed during his tour with Kerry and applied it to the philosophy of Angels & Airwaves, while he redefined himself as he learned to play piano and self-produce and formed his own home studio. ==Recording and production==