Black Label Society is an American heavy metal band formed in Los Angeles in 1998 by guitarist/singer Zakk Wylde. To date, the band has released eleven studio albums, two live albums, two compilation albums, one EP, and three video albums.

Roberto Agustín Miguel Santiago Samuel Trujillo Veracruz is an American musician who has been the bassist for heavy metal band Metallica since 2003. He first rose to prominence as the bassist of crossover thrash band Suicidal Tendencies from 1989 to 1995, while also collaborating with Suicidal Tendencies frontman Mike Muir for funk metal supergroup Infectious Grooves. After leaving Suicidal Tendencies, he performed with Ozzy Osbourne, Jerry Cantrell, and heavy metal band Black Label Society. Trujillo joined Metallica in 2003 and is the band's longest-serving bassist. He was inducted to the Rock and Roll Hall of Fame as a member of Metallica in 2009.