Musically, Death Magnetic is a radical departure from Metallica's previous album, St. Metallica began writing music for a new album in 2006, later recording the album at different studios across Los Angeles County, California, from March 2007 to May 2008. It is also the first Metallica album to feature bassist Robert Trujillo, and the second to share writing credit to all of the band's members. And Justice for All (1988) not to be produced by longtime collaborator Bob Rock. The album was produced by Rick Rubin, marking the band's first album since. Death Magnetic is the ninth studio album by American heavy metal band Metallica, released on September 12, 2008, through Warner Bros.