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Technical death metal (also known as tech-death, progressive death metal, or prog-death) is a subgenre of death metal that employs dynamic song structures, uncommon time signatures, atypical rhythms and unusual harmonies and melodies. Bands described as technical death metal or progressive death metal usually fuse common death metal aesthetics with elements of progressive rock, jazz or classical music. While the term technical death metal is sometimes used to describe bands that focus on speed and extremity as well as complexity, the line between progressive and technical death metal is thin. "Tech death" and "prog death", for short, are terms commonly applied to such bands as Nile, Edge of Sanity, and Opeth. Necrophagist and Spawn of Possession are known for a classical music-influenced death metal style. Death metal pioneers Death also refined their style in a more progressive direction in their final years. Some albums for this subgenre are "Hallucinations" (1990) by the German band Atrocity and Death's "Human" (1991). This style has significantly influenced many bands, creating a stream that in Europe was carried out at first by bands such as Gory Blister and Electrocution. The Polish band Decapitated gained recognition as one of Europe's primary modern technical death metal acts.