US rapper Eminem performs on August 22, 2013 during a concert at the Stade de France in Saints-Denis, near Paris. AFP PHOTO / PIERRE ANDRIEU (Photo credit should read PIERRE ANDRIEU/AFP/Getty Images)
James Hetfield, the singer and guitarist for heavy rock band Metallica, performs at the Rock in Rio music festival on September 25, 2011 in Rio de Janeiro. AFP PHOTO / ANDRE DURAO