Def Leppard are a hard rock band British formed in 1977 has become the most famous and influential in the current New Wave of British Heavy Metal at the turn of the late seventies and early eighties. They obtained a global success especially in the period from 1983 to 1987. They debuted in the NWOBHM with a heavy metal classic British-style before moving on a hair / pop metal with sharp melodic and AOR. Their musical style has allowed them to sell over 65 million albums worldwide in more than 30-year career, becoming among the most representative of the same pop metal thanks to albums like Pyromania (1983) and Hysteria (1987). Their music became a reference especially for the heavy metal scene US, closest to the melody and the elements AOR.