Through the help of producer and collaborator Mutt Lange, Def Leppard managed to hit upon their signature sound by 1981’s High ‘n’ Dry. Their follow-up, 1983’s Pyromania, contained one of the band’s most enduring tracks, ‘Photograph’. Equal parts high-octane rock song and smooth pop hit, ‘Photograph’ was Def Leppard’s breakthrough in America, becoming their first top-20 hit in the US.