Def Leppard are an English rock band formed in 1977 in Sheffield as part of the new wave of British heavy metal movement. Since 1992, the band has consisted of Joe Elliott (lead vocals), Rick Savage (bass, backing vocals), Rick Allen (drums, backing vocals), Phil Collen (guitars, backing vocals), and Vivian Campbell (guitars, backing vocals), which has been the band's most stable line-up.
The band's strongest commercial success came between the early 1980s and the early 1990s. Their 1981 album, High 'n' Dry, was produced by Robert John "Mutt" Lange, who helped them begin to define their style, and the album's main track "Bringin' On the Heartbreak" became one of the first rock videos played on MTV in 1982. The band's next studio album, Pyromania, was released in January 1983, with "Photograph" and "Rock of Ages" as the lead singles. In the U.S., Pyromania was certified diamond (10× platinum), making Def Leppard among the most popular music groups at the time. In 2003, the album ranked number 384 on Rolling Stone's 500 Greatest Albums of All Time.