As the final notes ring out on Lost in the Sound of Separation, it's evident that the six men of Tampa, Florida-based Underoath -- who've built their career on being both heavy and experimental '" have delivered their most ambitious and accomplished disc to date. Succinct and resolute, there's little denying that the 43-minute, 11-track follow-up to 2006's rapturously received and gold-certified Define the Great Line is a hard music masterpiece.