Underoath are a Grammy-nominated metalcore band from Tampa, Florida, formed in 1998. The band's line-up consists entirely of Christian members. They are currently signed to Solid State Records and are the label's best selling band. After several line-up changes, Underoath's only original member is drummer Aaron Gillespie.

During the band's early years, when they were fronted by former vocalist Dallas Taylor, Underoath displayed a more deathcore sound with their music, with double-bass drums and breakdowns. With Taylor, they released Act of Depression, Cries of the Past, and The Changing of Times. Following his leave, Spencer Chamberlain became lead vocalist. The band then released They're Only Chasing Safety and Define the Great Line, gaining a certified gold rating and the highest-charting Christian album on The Billboard 200 since 1997, respectively. These two albums gave them more mainstream and commercial success.

They have recorded a live CD/DVD album called Survive, Kaleidoscope, which was released in May 2008. From late February to early May the band recorded a new studio album called Lost in the Sound of Separation, which was released on September 2, 2008. The album was welcomed with critical acclaim from respected reviewers, with one reviewer calling it ‘unpredictable and ear-splitting, full of ferocity and melody’.

Lead Guitarist Timothy McTague explains why Underoath matter: “For me, the kids that we meet at shows who come up to us and tell us, ‘I was going to kill myself and then I heard this song of yours that changed my life around spiritually.’ Or even the one who said, ‘I had no one to turn to when my parents divorced, but your record got me through it.’ That’s what it’s all about for me. That’s what makes us more than just some crappy rock band”.