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Interviewed twenty-seven years and three days after the recording of Master of Puppets began, today it seems as if its producer’s abiding memory of the entire process is that of watching James Hetfield track one devilishly precise rhythm guitar part on top of another. ‘I’ve never seen anything like that since,’ he says. ‘And neither do I expect to.
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Paul Brannigan (Birth School Metallica Death, Volume 1: The Biography)