For the duration of "St. Anger"s recording period, producer Bob Rock played bass on the album and in several live shows at which Metallica performed during that time. Once the record was completed, the band started to hold auditions for Newsted's permanent replacement. Bassists Pepper Keenan, Jeordie White, Scott Reeder, Eric Avery, Danny Lohner, and Chris Wyseamong othersauditioned for the role. After three months of auditions, Robert Trujillo, formerly of Suicidal Tendencies and Ozzy Osbourne's band, was chosen as the new bassist. Newsted, who had joined Canadian thrash metal band Voivod by that time, was Trujillo's replacement in Osbourne's band during the 2003 Ozzfest tour, which included Voivod.