The opening track on “Master of Puppets,” widely regarded as the apex of the thrash genre, “Battery” begins with a menacing, ascending classical guitar riff. It escalates from there into a frenzied uptempo crusher, which pays homage to Metallica’s loyal fans. The fans are the battery that gives them the power to rock.

Also, there were some clubs on Battery St. in San Francisco, where Metallica did most of their damage in the early days.

Battery St. That’s where a lot of our life was lived, you know? it just felt like a home, this is where we get our energy!

—James Hetfield, It’s Electric