Chamberlain joined "everything was just normal, we clicked". After Chamberlain became a permanent member, Underoath discussed the possibility of changing the name and becoming a new band. Ultimately, the members decided to remain as Underoath. They're Only Chasing Safety (2004–2005) After taking the end of 2003 off from touring to begin working on an album, the band scheduled time in February 2004 to begin recording. During the early months of 2004, Underoath returned to the studio with Chamberlain as lead vocalist and producer James Paul Wisner. They're Only Chasing Safety was released on June 15, 2004, and proved to be a more commercial success for the band, going onto outsell the previous three albums combined. The album sold close to 100,000 copies in its first week of release and was certified gold by the end of 2005, selling more than 487,000 copies. With Gillespie being the only original member, They're Only Chasing Safety had been a vast change in sound and rhythm from what they performed earlier on. "Reinventing Your Exit" and "It's Dangerous Business Walking out Your Front Door" were released as the album's two singles and both songs spawned music videos that received frequent airplay on MTV2 and Fuse. In March 2005, Underoath participated in the inaugural Taste of Chaos tour, and shortly after, embarked on their first headlining tour. The band premiered two brand-new songs during the length of the tour. They played a part of the Warped Tour, but declined to perform for the entirety of the tour in order to take time to record another album. Underoath made their first covers of national magazines appearing on CCM Magazine in July 2005 and then Alternative Press in September, and in October, They're Only Chasing Safety was re-released in a two-disc set with four formerly unreleased songs. Also included was re-mastered album artwork by Jacob Bannon of Converge, and a DVD with over two hours of footage of the band touring in support of the album. As of 2005, They're Only Chasing Safety has sold more than 218,000 copies, with the re-release selling an additional 279,000 copies, making a combined sales of more than 500,000 copies in the US alone. Define the Great Line (2006–2007) The title for their fifth album, Define the Great Line is presented upon the theory of an individual having "to find that line and that way to live your life." The band