Lead singer James Hetfield, right, and Kirk Hammett, guitar, of the heavy 

Lead singer James Hetfield, right, and Kirk Hammett, guitar, of the heavy metal rock band "Metallica" perform during a concert at the Sports Palace, in Mexico City, Saturday, July 28, 2012. (AP Photo/Christian Palma)
Associated Press
Lead singer James Hetfield, right, and Kirk Hammett, guitar, of the heavy metal rock band "Metallica" perform during a concert at the Sports Palace, in Mexico City, Saturday, July 28, 2012. (AP Photo/Christian Palma)
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