On July 2, 1986, Metallica released the only single from their foundational third album, Master of Puppets. The album already dropped that March to high praise, but the release of the title track as a single brought even more attention to Metallica as a pillar of the heavy metal genre. “Master of Puppets” is the second track on the album, following the more traditional thrasher “Battery”. But where “Battery” opens the album with high-octane spee…