It's good that Leppard didn't change its spots

While Def Leppard's days as mainstream superstars have passed, they remain one of the most durable of the '80s metal groups.

Despite some high-profile tragedies in the group – drummer Rick Allen losing an arm, guitarist Steve Clark losing his life – they've remained together for 25 years.

Perhaps the biggest reason for the band's longevity is its trashy, infectious singles, such as "Pour Some Sugar on Me,"

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