Def Leppard not only maintain, but also extend one of rock music’s greatest legacies by consistently delivering airtight songcraft and top-flight performances on each subsequent tour, release, and new frontier. That’s why they’ve moved over 100 million records worldwide. It’s why they’re “one of only five rock bands with two original studio albums selling over 10 million copies in the U.S.” It’s why their admirers span everyone from Metallica to Taylor Swift. It’s why the music endures forty years since their 1977 formation in Sheffield, UK.