Chamberlain has released five albums with Underoath, "They're Only Chasing Safety" (2004), "Define the Great Line" (2006), "Lost in the Sound of Separation" (2008), "Ø" (2010), and "Erase Me" (2018). When Define the Great Line was released on June 20, 2006, it sold 98,004 copies within its first week and debuted on the "Billboard" 200 Chart at No. 2. After They're Only Chasing Safety, Chamberlain worked with Melissa Cross to add deeper screaming into the mix. Chamberlain then noted that his vocals on "Define The Great Line" sound less like imitations of Dallas Taylor's vocals, and more similar to the vocals that he used in his previous band, This Runs Through. His evolved vocals came with the help of Melissa Cross, who coached Chamberlain and refined his "growl". Alternative Press noted, "his bellow more carnal and guttural, [and his high end more tuneful than whiny. Now when Chamberlain's relating those things that eat at the edges of his conscience and his soul, he has the kind of multi-faceted caterwaul to convey that despair." The article also comments on his songwriting, saying that it "reaches inward, confronting every ugly crevice of his being, often emerging from the clash furious and disoriented, but hopeful."