What heavy metal band released the classic "Master of Puppets"?

Metallica

Who directed the animated film "Spirited Away"? Who voiced animated character Megara in Disney's "Hercules"? Who was the famous Byzantine emperor known for codifying Roman law? What historical period is known for post-Civil War industrial growth and wealth disparity? What massive infrastructure project was completed in 1914, greatly facilitating ocean trade between the Atlantic and Pacific?