Metallica's third studio album Master of Puppets was released on March 3, 1986. The album received universal praise while illuminating current social issues and greatly influencing future metal artists. The title track is one of Metallica's all-time best with lyrics describing cocaine addiction and music displaying beautiful guitar riffs, powerful chorus vocals and a melodic interlude.

The Thing That Should Not Be describes author H.P. Lovecraft's Cthulu, the overlord of the undersea civilization The Deep Ones, and features heavy riffs simulating Cthulu dragging itself onto the shores of Innsmouth to slaughter the non-believers! Welcome Home (Sanitarium) features lyrics based on Ken Kesey's One Flew Over the Cuckoo's Nest and describes a man unjustly locked up in a mental asylum and displays gloomy verses, heavy choruses and upbeat, climactic ending instrumentals.

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