Archangels in Black is the fourth studio album by Adagio. According to their Website, the mastering of Archangels in Black was completed on September 3, 2008. After numerous delays, the album was officially released on February 2, 2009 in Europe. The band stated that "the compositions are the ultimate balance between melodic and extreme metal and can be considered as a more brutal version of Underworld". Archangels in Black is Adagio's first and only album to include Christian Palin on vocals, but the backing vocals were sung by Gustavo Monsanto, Adagio's former vocalist who sang on Dominate.[http://www.metalstorm.ee/events/news_comments.php?news_id=7463 Adagio - Sign With Listenable Records] metalstorm.ee. 2008-10-13. Retrieved on 2009-07-12.