 Def Leppard, often categorized with the new wave of British heavy metal, released their second album High 'n' Dry in 1981, mixing glam-rock with heavy metal, and helping to define the sound of hard rock for the decade. Their follow-up album Pyromania (1983), certified Diamond by the Recording Industry Association of America (over 10 million copies sold in the US), reached number two on the Billboard 200. The singles "Foolin '", "Photograph", and "Rock of Ages", helped by the emergence of MTV, reached the Top 40. Def Leppard's Pyromania style was widely emulated, particularly by the emerging Californian scene.
