Metallica is
an American heavy metal band from Los Angeles, California, whose
releases include fast tempos, instrumentals, and aggressive musicianship
that placed them as one of the founding "big four" of thrash metal
alongside Slayer, Megadeth, and Anthrax. They formed in 1981 when
James Hetfield responded to an advertisement that drummer
Lars Ulrich had posted in a local newspaper. As of 2003, the line-up features long-time lead guitarist
Kirk Hammett (who joined the band in 1983) and bassist
Robert Trujillo (a member since 2003) alongside Hetfield and Ulrich. Previous members of the band are lead guitarist
Dave Mustaine (who went on to found the band Megadeth), and bassists
Ron McGovney,
Cliff Burton and
Jason Newsted.
The band also had a long collaboration with producer Bob Rock, who
produced all of its albums from 1990 to 2003 and served as a temporary
bassist between the departure of Newsted and the hiring of Trujillo.