Metallica was the subject of the acclaimed 2004 documentary film Metallica: Some Kind of Monster, which documented the troubled production of the band's eighth album, St. In 2000, Metallica led the case against the peer-to-peer file sharing service Napster, in which the band and several other artists filed lawsuits against the service for sharing their copyright-protected material without consent after reaching a settlement, Napster became a pay-to-use service in 2003. After experimenting with different genres and directions in subsequent releases, the band returned to its thrash metal roots with the release of its ninth album, Death Magnetic (2008), which drew similar praise to that of the band's earlier albums. Its eponymous fifth album, Metallica (1991), the band's first to root predominantly in heavy metal, appealed to a more mainstream audience, achieving substantial commercial success and selling over 16 million copies in the United States to date, making it the best-selling album of the SoundScan era. The band's third album, Master of Puppets (1986), was described as one of the heaviest and most influential thrash metal albums. Metallica earned a growing fan base in the underground music community and won critical acclaim with its first five albums. Guitarist Dave Mustaine (who went on to form Megadeth after being fired from the band) and bassists Ron McGovney, Cliff Burton (who died in a bus accident in Sweden in 1986) and Jason Newsted are former members of the band. Metallica's current lineup comprises founding members and primary songwriters Hetfield and Ulrich, longtime lead guitarist Kirk Hammett and bassist Robert Trujillo.

The band was formed in 1981 in Los Angeles by vocalist/guitarist James Hetfield and drummer Lars Ulrich, and has been based in San Francisco for most of its career.The band's fast tempos, instrumentals and aggressive musicianship made them one of the founding 'big four' bands of thrash metal, alongside Megadeth, Anthrax and Slayer. Metallica is an American heavy metal band.

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