It started as a gig. Last fall, Def Leppard singer Joe Elliott opened for his favorite band, British hard-rock legends Mott The Hoople, at one of their reunion shows in London. Backed by members of the English band the Quireboys, Elliott covered deep tracks from the weird period after Mott The Hoople broke up in 1975: singer Ian Hunter's early solo albums; records by the spinoff bands Mott and British Lions. "I wanted people to go, 'I never thought I'd hear that song live again ever!'" Elliott recalls.