Ulrich estimates Metallica have spent about nine months on the project so far as they review the new material in a variety of ways. "Nowadays, we sit and go, 'That's a great piece of music,' and 'That's really cool,' and then we'll play it faster, then slower, then half a step down, exploring all these options," he says. "There are 75 different ways to play something, and you end up f***ing driving yourself nutty." Read more here.

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