technical metal 

A sub genre of metal combining technical and complex guitar and drum patterns often associated with polyrhythms, djent and odd time signatures, with distorted rhythms. Some good examples of technical metal bands are "The Dillinger Escape Plan" and "Polyphia."

Another name for Technical Metal is Progressive Metal.

Person 1: Hey dude! Check out this new band! They are so technical.

Person 2: Nice dude! I love Technical Metal!

Person 1: I love the polyrhythm riff technicalities of the guitar riffs and drum patterns!

technical metal by lakebehemoth February 15, 2014

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