Def Leppard have compiled a thorough accounting of their earliest days — when they burst out of their native Sheffield, England, as part of the New Wave of British Heavy Metal — for a new box set.

After last year's excitement of its first new album in seven years, Def Leppard has gone from rock brigade to rock Bach 'til you drop. Drastic Symphonies, a team-up with Britain's Royal Philharmonic ...