Hollywood Undead is an American rap rock band from Los Angeles, California, formed in 2005. They released their debut album, Swan Songs, on September 2, 2008, and their live CD/DVD Desperate Measures, on November 10, 2009. Their second studio album, American Tragedy, was released April 5, 2011. All of the band members use pseudonyms and wear their own unique mask, most of which are based on the common hockey goaltender design.

The band originated on June 3, 2005, as The Kids from a song titled "Hollywood" (Later released as "The Kids") that Jorel Decker (J-Dog), Aron Erlichman (Deuce), and Jeff Phillips (Shady Jeff) posted on the band's MySpace profile to positive reviews, leading them to form the group Hollywood Undead with their friends George "Johnny 3 Tears" Ragan, Jordon "Charlie Scene" Terrell, Dylan "Funny Man" Alvarez, and Matthew "Da Kurlzz" Busek. In an interview with Shave magazine, J-Dog explained that when forming the band "Whoever was in the room at the time and played an instrument was in the band." Phillips later left the group because of conflict with Erlichman.  The band only took one year working on their debut album, Swan Songs. The other two years were spent looking for a company that wouldn't try to censor the album. They first signed a record contract with MySpace Records in 2005 but they left the label after the label tried to censor their first album. They then signed a contract with A&M/Octone Records and their first album, Swan Songs was released on September 2, 2008, and reached No.22 on the Billboard 200 in its first week of release, selling 21,000 copies; which was later on released in the United Kingdom on May 18, 2009, with two bonus tracks. In April 2009, the band toured with American electronic musician Skrillex as "Sonny and the Blood Monkeys". On June 23, 2009, Hollywood Undead released Swan Songs B-Sides EP through iTunes.  The band released a CD/DVD set entitled Desperate Measures on November 10, 2009. The set includes a CD of previously unreleased six new songs, three of which are cover songs, as well a previously unreleased remix of "Everywhere I Go", and six live recordings of songs from Swan Songs, and a DVD of a full live performance by the band. In December 2009, the band won Best Crunk/Rock Rap Artist at the Rock on Request Awards. In its first week of release, Desperate Measures reached No. 29 on the Billboard 200. It also peaked at No. 10 on the Billboard's Rock Albums chart, No. 8 on the Alternative Albums chart, No. 5 on the Hard Rock albums chart, and No. 15 on the Digital Albums chart.

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