found:Crocker, C. Def Leppard, 1986:t.p. (Def Leppard) p. 4, etc. (first great heavy metal band of the 1980s; Def Lep; Deaf Leopard)
found:All Music, viewed May 14, 2015(Def Leppard; formed 1977; Group Members: Joe Elliott, Pete Willis, Phil Collen, Rick Allen, Rick Savage, Steve Clark, Tony Kenning, Vivian Campbell) -http://www.allmusic.com/artist/def-leppard-mn0000193320