Def Leppard is gearing up for another Las Vegas residency, and frontman Joe Elliott admitted that narrowing down the setlist is “always a challenge.” “We've kind of grown into a routine of what we like to call the A, B and C list,” the longtime frontman explained during an interview with Houston Life. “And your A list is your crown jewels, the ones that if you don't play them, you wouldn't get out the building alive. And then there's the B list of interesting stuff. And then the C list is, like, 'Oh, that's interesting. They haven't played that one...