What makes Ceux du dehors by Univers Zéro notable?

This album is notable for its significant impact on the Belgian progressive rock scene and its role in establishing Univers Zéro as pioneers of the Rock in Opposition movement. Critics have praised its complex arrangements and dark thematic content, contributing to its enduring influence on subsequent avant-garde and progressive musicians. Released in 1981, 'Ceux du dehors' was Univers Zéro's second album, following their debut 'Heresie' from 1979. At this point, they were solidifying their reputation in the avant-prog scene, blending influences from classical and contemporary music to create a unique sound that would define their legacy.