This video used to be on the Def Leppard's Slang Web Site. International superstar rock band Def Leppard made an unusual concert appearance on Thursday, May 9 (1997) to a small group of lucky fans at the UCLA ZBT fraternity house. The band performed songs off their new release, Slang, for a live broadcast from the frat party to radio stations across the country. View exclusive video clips from their performance.