Moore was born in the Highland Park neighborhood of Northeast Los Angeles,[7][8] but moved to the Forest Hill neighborhood of San Francisco at the age of 2, where he attended elementary school. At the ages of 9 and 10, Moore attended a local boarding school located in the Mojave Desert LV, but eventually moved back to Northern California. By the time he was 12, his family moved back to his birthplace of northeast L.A., where he enrolled in a private academy school specializing in arts. Later he was home schooled at the age of 14 due to bullying. In 2004, he learned he was adopted[9] and dropped out of the program when he was 16.[10][11] While a young teenager in Los Angeles, Moore would attend punk gigs in Mexican American neighborhoods in East and South Los Angeles, and later at electro club raves in the downtown's Silver Lake and Echo Park neighborhoods.[12][13]
2004–07: From First to Last
Sonny Moore in 2008
In 2004, Moore contacted Matt Good of From First to Last about playing guitar for the band on their debut album. After flying out to Georgia, Moore was heard singing by three studio producers, Derrick Thomas, Eric Dale, and McHale Butler, and was then made lead singer, with Good playing guitar. In June 2004, Epitaph Records released the band's first full-length record with their new bandmate, Dear Diary, My Teen Angst Has a Body Count. After performing on several successful tours, two being the Vans Warped Tour and Dead by Dawn tour, they began recording their second album, Heroine with producer Ross Robinson. The album was released in March 2006 on Epitaph. With high record sales once again, the band found themselves part of many successful tours, until Moore started suffering vocal problems, causing the band to resign from several tours. After going through a successful vocal surgical procedure, Moore informed the band he would be permanently resigning to work on a solo career. FFTL's last show performed with Moore was in their hometown of Orlando at The House of Blues while touring with Atreyu.
Moore announced he had left From First to Last to pursue a solo career. He then launched a Myspace page displaying three demos ("Signal", "Equinox", and "Glow Worm"). This led to Moore's first performance since his leaving From First to Last. On April 7, 2007, alongside harpist Carol Robbins, Moore played several original songs at a local art building. After months of releasing demos via Myspace, Moore played on the Team Sleep Tour with a full band. The tour also featured supporting acts Monster in the Machine and Strata. Moore made several demo CDs available on this tour, limited to about 30 per show. These CDs were tour exclusive, and were packaged in "baby blue envelopes", each with a unique drawing by Moore or bandmate.