When Metallica began gathering together everything they had in their vaults to include in a super-deluxe, box-set reissue of their touchstone 1986 LP Master of Puppets, they realized they had a lot more material to work with than on the reissues of their first two albums. “The hardest part of it all was the ‘kitchen sink element,'” Lars Ulrich tells Rolling Stone. “There’s a certain exaggerated, perverse beauty in just overwhelming people with as much stuff as possible, but there is also some line in the sand somewhere where it just gets to be too much. If we included everything from that time period, you would need a f—— forklift to get this thing into your house.”

Read the new interview with Kirk Hammett and Lars Ulrich here.