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Thrash metal is a subgenre of heavy metal music that emerged in the early 1980s and is characterized by its fast tempo, aggressive guitar playing, and shouted lyrics. Notable thrash metal bands include Metallica, Slayer, and Megadeth. Slayer is an American thrash metal band from Huntington Park, California. Formed in 1981, the band is often considered one of the "big four" thrash metal bands, along with Metallica, Anthrax, and Megadeth.