They released Act of Depression, Cries of the Past, and The Changing of Times with the band's original vocalist Dallas Taylor. Following his departure, Spencer Chamberlain became lead vocalist. The band then released They're Only Chasing Safety and Define the Great Line, gaining a certified gold rating for both. These two albums have given them more mainstream and commercial success. They have received two Grammy nominations in 2007 and 2010 respectively and have recorded a live CD/DVD box set entitled Survive, Kaleidoscope, which was released on May 27, 2008. From late February to early May the band recorded their sixth studio album entitled Lost in the Sound of Separation, which was released on September 2, 2008, and peaked at number 8 on the Billboard 200. Their last album Ø (Disambiguation) was released on November 9, 2010, and is the first without the band's last original member, drummer and vocalist Aaron Gillespie after parting ways with the band earlier in the year.