What does the band Metallica base their style upon?

Answer 1

Metallica falls under the Thrash Metal category. They are noted as being one of the four bands that make up The Big Four of Thrash Metal, along with Anthrax, Megadeth, and Slayer.

The members of Metallica have said that their primary influences in music were early heavy metal bands such as Black Sabbath, Deep Purple, Led Zeppelin and and Scorpions, New Wave of British Heavy Metal bands such as Venom, Motorhead, Diamond Head, Judas Priest, and Iron Maiden.