Singer Axl Rose, left, and AC/DC lead guitar player Angus Young perform during the concert of Australian rock band AC/DC in Lisbon Saturday night, May 7 2016. On Saturday, AC/DC kicked off the 12-concert European leg of their “Rock or Bust” world tour with American hard rock band Guns N’ Roses singer Rose replacing the band’s legendary vocalist Brian Johnson who had to quit the tour due to health issues. Rose sang seated on a chair due to a broken foot. (AP Photo/Armando Franca)

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