The band was founded when James Hetfield responded to an advertisement that drummer Lars Ulrich had posted in a local newspaper. The current 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. Notable previous members of the band include former lead guitarist Dave Mustaine (who later went on to found the band Megadeth) and former bassists Ron McGovney, Cliff Burton and Jason Newsted. The band also had a long collaboration with producer Bob Rock, who produced all of the band’s albums from 1990 to 2003 and served as a temporary bassist between the departure of Newsted and the hiring of Trujillo.