Technical Death Metal 

Often used interchangeably with progressive death metal, technical death metal (or simply "tech death") is a subgenre of brutal death metal that emphasizes complexity. It can be influenced by jazz or classical music. Some tech death metal bands have incorporated psychedelia, Aboriginal music, Mediterranean modes, and even symphonic elements into their music.

Decapitated is one of the most prominent technical death metal acts.

Technical Death Metal by Jesus Christ, Peace Be Upon Me September 17, 2011