After dominating late '80s pop and hard rock radio with seven singles from their album Hysteria it took a while for Def Leppard to get a new album out.  During that time guitarist Steve Clark passed away and longtime producer Robert John "Mutt" Lange decided to go on to other projects.  Still, the band carried on briefly as a quartet, using what they could of Clark's work on Adrenalize and still scoring a major hit album even though it was clear the formula was wearing thin.