You may be thinking "Def Leppard isn't a metal band" however you are partially right but Def Leppard does have some Heavy Metal songs all of them are from their first EP and Studio album. In their early days they were a part of the New Wave of British Heavy Metal and because of this they were accepted on the Encyclopedia Metaltium Metal Archives, They were accepted because of their first album On Through the Night and possibly the Def Leppard EP as well.