Def Leppard are an English rock band formed in 1977 in Sheffield. They established themselves as part of the new wave of British heavy metal movement of the early 1980s.
Def Leppard's music is a mixture of hard rock, AOR, pop and heavy metal elements, with its multi-layered, harmonic vocals and its melodic guitar riffs. The band's greatest commercial success came between the early 1980s and the early 1990s.