Metal can be characterized by the use of highly distorted guitars, double bass, sreaming of the phrase "666", use of metal horns, worshipping of satan, lyrics containing highly suggestive suicidal imagery, and the occasional goat sacrifice.
Hope that clears it up for you. BTW, please do not list Tool or Dream Theater in your list. They are not "metal".
Hope that clears it up for you. BTW, please do not list Tool or Dream Theater in your list. They are not "metal".