Lang Lang and Metallica rehearse for the Grammy Awards This image appears in the gallery:Lang Lang rehearses with Metallica for the 2014 Grammys 13. Lang Lang and Metallica rehearse for the Grammy Awards Metallica's legendary duelling guitarists James Hetfield and Kirk Hammett, and Lang Lang. 15 images See the full gallery: Lang Lang rehearses with Metallica for the 2014 Grammys