In this 2013 file photo, James Hetfield, left, and Kirk Hammett of Metallica perform on at Comic-Con International Convention.
In this 2013 file photo, James Hetfield, left, and Kirk Hammett of Metallica perform on at Comic-Con International Convention. Chris Pizzello Invision/AP
In this 2013 file photo, James Hetfield, left, and Kirk Hammett of Metallica perform on at Comic-Con International Convention. Chris Pizzello Invision/AP