He invented Italo disco, produced “Flashdance,” gave us Donna Summer's best songs—and Giorgio Moroder's influence doesn't end there. New Order borrowed his rubbery bass throb for New Wave's iconic “The Perfect Kiss”; Derrick May's “Strings of Life” transposed his orchestral fantasias for the nascent sound of house and techno. And Hercules & Love Affair's “Blind” is a reminder of retro disco's staying power.