It reached the top 40 on the Billboard 200, while its lead single "Say This Sooner" peaked at number seven on the Modern Rock chart. Drummer Aaron Gillespie spent some time with his other band the Almost, who released their debut album Southern Weather in April 2007. A month after that album's release, the band started writing new material for its follow-up. Alongside this, it peaked at number two on the Billboard 200, becoming the highest-charting Christian release to do so since 1997. It had sold almost 100,000 copies in its first week, and had been certified gold at the end of the year. Underoath released their fifth studio album Define the Great Line in June 2006. It was nominated for a Grammy Award for Best Boxed or Special Limited Edition Package, and a Dove Award for Recorded Music Packaging of the Year. Alongside this, it topped the Top Christian Albums chart, and peaked at number 15 in Canada. The album reached number eight on the Billboard 200 chart, selling around 56,000 copies in its first week of release. Lost in the Sound of Separation received generally favorable reviews from music critics, some of whom saw it as more experimental than the band's previous works, while others regarded it as a refinement of Define the Great Line. Underoath spent the next three months touring as part of the Warped Tour. The music video for "Too Bright to See Too Loud to Hear" appeared on the band's Myspace profile in April 2009 it was released to radio on June 2, 2009. To open 2009, they went on a co-headlining Canadian tour with Norma Jean, before touring Europe as part of the Give it a Name festival. They then embarked on a headlining tour of the United States, and closed out the year with shows in South and Central America. The song was released to radio on Septemaround this time, the band toured across parts of Europe, South Africa, Australia. Underoath headlined one stage at the inaugural Mayhem Festival prior to the release of the "Desperate Times Desperate Measures" at the end of August 2008. The album has been described as metalcore, post-hardcore and screamo, with elements of industrial, recalling the works of Refused, At the Drive-In, and Cult of Luna. The band produced the album with Adam Dutkiewicz and Matt Goldman, both of whom worked on Define the Great Line. They decided to go on a hiatus Lost in the Sound of Separation was recorded at Glow in the Dark Studios in Atlanta, Georgia in March and April 2008. Following the release of their fifth studio album Define the Great Line (2006), relationships between members became strained to the point they almost broke up. It was released on September 2, 2008, through Solid State and Tooth & Nail Records. Lost in the Sound of Separation is the sixth album by American metalcore band Underoath.