"It's gonna be completely insane," guitarist Kirk Hammett told Rolling Stone from his home in San Francisco. "Lang Lang has interjected himself into the song in a way I don't think anyone else has ever done in the course of our career. He's going to be playing major parts of the song. He's going to be playing through the melody."
However given Lang Lang's classical training, Hammett is quick to point out that Metallica won't be going soft on the anti-war anthem that won a Grammy following the 1988 release of 'And Justice for All'.
"We're keeping all the heavy parts," he says. "And it's going to be really cool and it's really dynamic."
The world will hear Metallica and Lang Lang's interpretation of 'One' when the Grammy Awards are broadcast live on CBS. That week the group will release a traditional take on the song as one of the many tracks in their film Metallica: Through the Never, which will get a Blu-ray, 3-D Blu-ray, DVD and digital release.