Metallica is an American heavy metal band that formed in 1981 in Los Angeles, California. Founded when drummer Lars Ulrich posted an advertisement in a Los Angeles newspaper, Metallica's original line-up consisted of Ulrich, rhythm guitarist and vocalist James Hetfield, lead guitarist Dave Mustaine, and bassist Ron McGovney. These last two were later replaced from the band, in favor of Kirk Hammett and Cliff Burton, respectively. In September 1986, Metallica's tour bus skidded out of control and flipped, which resulted in Burton being crushed under the bus and killed. Jason Newsted replaced him less than two months later. Newsted left the band in 2001 and was replaced by Robert Trujillo in 2003.
Metallica was formed in Los Angeles, California, in early 1981 when drummer Lars Ulrich placed an advertisement in a Los Angeles newspaper—The Recycler—which read "Drummer looking for other metal musicians to jam with Tygers of Pan Tang, Diamond Head and Iron Maiden." Guitarists James Hetfield and Hugh Tanner of Leather Charm answered the advertisement. Although he had not formed a band, Ulrich asked Metal Blade Records founder Brian Slagel if he could record a song for the label's upcoming compilation Metal Massacre. Slagel accepted, and Ulrich recruited Hetfield to sing and play rhythm guitar.
Metallica has become one of the most influential heavy metal bands, and is credited as one of the "big four" of thrash metal, along with Slayer, Anthrax, and Megadeth. The band has sold more than 90 million records worldwide, including 57 million in the United States, which makes Metallica the most commercially successful thrash metal band. The writers of The Rolling Stone Encyclopedia of Rock & Roll felt Metallica gave heavy metal "a much-needed charge". Stephen Thomas Erlewine and Greg Prato of Allmusic said Metallica, "expanded the limits of thrash, using speed and volume not for their own sake, but to enhance their intricately structured compositions", calling the band "easily the best, most influential heavy metal band of the '80s, responsible for bringing the music back to Earth."