British rock band that was one of the prime movers of the new wave of British heavy metal. The original members were Pete Willis (b. Feb. 16, 1960, Sheffield, South Yorkshire, Eng.), Rick Savage (b. Dec. 2, 1960, Sheffield), Joe Elliott (b. Aug. 1, 1959, Sheffield), and Tony Kenning. Later members included Steve Clark (b. April 23, 1960, Sheffield—d. Jan. 8, 1991, London, Eng.), Phil Collen (b. Dec. 8, 1957, London), Rick Allen (b. Nov. 1, 1963, Dronfield, Derbyshire, Eng.), and Vivian Campbell (b. Aug. 25, 1962, Belfast, N.Ire.).

Formed in Sheffield by teenagers Willis, Savage, and Elliott in 1977, at the height of punk rock, Def Leppard forged an accessible melodic version of heavy metal that was slower to catch on at home than in the United States, where a new British Invasion of pop-oriented heavy metal bands revived the fading genre. After releasing an extended-play record on their own label, the band reached the British charts with their first album, On Through the Night (1980). Wide exposure for music videos (music video) that capitalized on the band's good looks pushed High 'n' Dry (1981), Def Leppard's second album (and their first with producer-cowriter Robert 【“Mutt”】 Lange), to sales of two million copies; however it was the metal classic Pyromania (1983), with hits such as “Photograph” and sales of more than 10 million copies, that assured the group's place in rock history. Hysteria (1987) followed, selling more than 14 million copies and generating hit singles for two years, as the band survived Willis's firing and drummer Allen's loss of an arm in an automobile accident. In 1991 guitarist Clark died of a drug overdose, and, though the band continued to produce hits in the 1990s, it never regained its exalted status.