Def Leppard is 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). The band’s strongest commercial success came between the early 1980s and the early 1990s. Def Leppard’s fourth album Hysteria, released in 1987, topped the UK and U.S. album charts. As of 2009, it has been certified 12× platinum for sales of over 12 million in the U.S. and has gone on to sell over 25 million copies worldwide.