 The album expands upon the group's previous full-length, "Panopticon", further exploring lead singer Aaron Turner's clean vocals (though his former techniques, which relied more on screaming and growling are still present as well).Musically, the album is dynamic, ranging from extended musical ambience to almost tribal drumming.Isis continued their lengthy songwriting; "In The Absence of Truth" is in fact Isis' longest record, at almost 65 minutes.