"Enter Sandman" is about a child's nightmares. The lyrics explore the fear and anxiety associated with nightmares. While the music was written by Kirk Hammett, James Hetfield, and Lars Ulrich. Originally, Hetfield's lyrics were about crib death.

It contains themes of political and legal injustices, such as corruption and war. The cover was designed by Roger Gorman with illustration by Stephen Gorman and based on a concept by Metallica founders

Metallica song "Master of Puppets" is primarily about drug addiction, using the metaphor of an addict being controlled by a "master"

The meaning of the Metallica album Load primarily refers to the title and cover art, which was inspired by a song called "King Nothing" and the controversial artwork by Andres Serrano, respectively.

The meaning of Metallica's Reload is that it was the second half of a planned double album with Load. The band decided to split the 27 songs into two separate releases due to time constraints and the desire to stagger the releases.