Def Leppard is an English rock band formed in 1977 in Sheffield as part of the New Wave of British Heavy Metal movement. The band's music is marked by a mix of hard rock, glam metal, and pop, characterized by layered guitar harmonies, soaring choruses, and the distinctive raspy vocals of lead singer, Joe Elliott. Def Leppard achieved significant commercial success in the 1980s and 1990s, particularly with their albums "Pyromania" (1983) and "Hysteria" (1987), which have both been certified Diamond by the RIAA. Their innovative use of pop hooks in a heavy metal context has been influential in the rock genre.