The solution was "a great vocal sound" so that Hetfield didn't have to double-track, the producer explains. "I said, 'What you hear in Chris Isaak's voice is the nuances when he sings. He isn't doubled, he's actually performing. You perform.' We set it up so he had a great sound and then he sang." Read more and hear comparisons between Hetfield and Isaak's vocals here.

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