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The band's fast tempos, instrumentals, and aggressive musicianship placed them as one of the founding "big four" bands of thrash metal, alongside Anthrax, Megadeth, and Slayer. Metallica earned a growing fan base in the underground music community and won critical acclaim with its first four albums; their third album Master of Puppets (1986) was described as one of the most influential and heaviest of thrash metal albums.