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Copper alloys are metal alloys that have copper as their principal component. They have high resistance against corrosion. Of the large number of different types, the best known traditional types are bronze, where tin is a significant addition, and brass, using zinc instead. Both of these are imprecise terms.
Extreme metal consists of a number of related heavy metal music subgenres that have developed since the early 1980s, usually characterized by a more abrasive, harsher, underground, non-commercialized style or sound nearly always associated with genres like black metal, death metal, doom metal, thrash metal, and sometimes speed metal. [106]