Trujillo joined Metallica on February 24, 2003, two years after Jason Newsted resigned. Zakk Wylde, a personal friend and bandmate from the Ozzy days, recruited him to play with Black Label Society for a few shows. The band released one studio album in Japan and one live album of their performance in Tokyo before disbanding. During this time, Trujillo formed an experimental supergroup, Mass Mental, with then Dub War singer Benji Webbe, whose "ragga-punk-metal" outfit had just disbanded. He was the subject of controversy for re-recording Bob Daisley's bass tracks for reissued versions of Osbourne's first two solo albums Blizzard of Ozz (1980) and Diary of a Madman (1981) after Daisley claimed that he was not paid proper royalties. Trujillo co-wrote several songs on the Down to Earth album. In contrast to his earlier jazz and funk inspired playing, Osbourne's band was more straightforward to hard rock and metal. Trujillo was a member of Ozzy Osbourne's band for a number of years starting in the late 1990s. Concurrent to his work with Suicidal Tendencies, Trujillo was a member of the band's side project, Infectious Grooves, along with vocalist Mike Muir. Initially billed as "Stymee" on the 1989 album Controlled by Hatred/Feel Like Shit.Déjà Vu, Trujillo remained in the band until the mid-1990s. Trujillo gained prominence when he replaced Bob Heathcote as the bassist for California crossover thrash band Suicidal Tendencies. Trujillo performing in the O2 Arena in London, 2008 He went to jazz school when he was 19 with the intention of becoming a studio musician, but he maintained his passion for rock and metal. And his whole attitude was punk." He began playing in "a lot of backyard party bands", playing music by Black Sabbath, Ozzy Osbourne, Rush, and Led Zeppelin.
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But Jaco had an edge that far exceeded his jazz persona. Trujillo stated that " Jaco was my hero growing up", and that the iconic jazz bassist changed his view of what the instrument could play: "Hearing him was like hearing Eddie Van Halen doing " Eruption" for the first time: You thought, 'What instrument is that?' I loved jazz fusion and branched out from there. Trujillo gained an interest in music during his childhood his mother was a huge fan of soul music, particularly musicians like Marvin Gaye, James Brown, and Sly and the Family Stone.
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He grew up in Culver City, California, where his father was a teacher at Culver City High School. He is of Mexican and Native American descent. Robert Trujillo was born in Santa Monica, California, on October 23, 1964.