He is the lead vocalist, rhythm guitarist, co-founder, and a primary songwriter of heavy metal band Metallica. He is mainly known for his intricate rhythm playing, but occasionally performs lead guitar duties and solos both live and in the studio.

Besides being one of Metallica's founding members and main songwriters, drummer Lars Ulrich is also the band's spokesman.

An elite heavy metal guitarist whose fleet, ferocious, and fluid playing style helped define the Bay Area thrash sound, Kirk Hammett co-founded speed/thrash luminaries Exodus before becoming the lead guitarist for Metallica.

Clifford Burton was an American musician who was the bassist for thrash metal band Metallica from 1982 until his death in 1986. He performed on the band's first three albums, Kill 'Em All, Ride the Lightning, and Master of Puppets.

Jason Newsted is an American musician who was the bassist of heavy metal band Metallica from 1986 to 2001. He first performed with thrash metal band Flotsam and Jetsam from 1981 to 1986 before joining Metallica to succeed the deceased Cliff Burton.

Robert Trujillo is an American musician who is most famous as the bass player for Metallica. He joined the band in 2003. Before that Trujillo played bass for Suicidal Tendencies, Infectious Grooves, Black Label Society, Jerry Cantrell and was a member of Ozzy Osbourne's band.