What makes Underworld by Adagio notable?

'Underworld' received critical acclaim for its ambitious arrangements and complex structures, often cited as a key release in the symphonic metal genre. The album helped establish Adagio as a significant player in the European metal scene, garnering attention from both fans and media alike. Released in 2003, 'Underworld' is Adagio's second studio album, following their debut 'Sanctus Ignis' (2001). At this point, the band was solidifying their identity within the power and progressive metal scenes, expanding their sound with intricate compositions and theatrical influences.