Metallica /m??tæl?k?/ is an American heavy metal band from Los Angeles, California, formed in 1981. Founded when drummer Lars Ulrich posted an advertisement in a local newspaper, Metallica's line-up has primarily consisted of Ulrich, rhythm guitarist and vocalist James Hetfield, and lead guitarist Kirk Hammett, while going through a number of bassists. Currently, the spot is held by Robert Trujillo.