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* CareerResurrection:
** After finding middling success with albums ''On Through The Night'' and ''High and Dry'' they were sought out by legendary producer Mutt Lange who "dragged them kicking and screaming" through recording ''Pyromania''. Three songs, "Photograph", "Rock of Ages" and "Foolin'", became top 40 singles in the US. However during the band's hiatus, drummer Rick Allen lost his arm in a car crash. The band toiled, refusing to fire Allen in the interim (despite the seeming ForegoneConclusion). However Allen discovered that he could keep time with songs on the radio with his feet and [[TakeAThirdOption designed a rig to allow him to use his left foot to keep drumming]]. The band then released ''Hysteria'' which might have been their last album if it didn't sell well. Though fairly successful at first, it hadn't generated the sales Def Leppard needed until they released the single "Pour Some Sugar on Me" (which would become their SignatureSong); ''Hysteria'' would sell over 20 million copies worldwide, getting certified diamond.
** While recording ''Hysteria's'' follow-up, guitarist Steve Clark's addiction struggles became worse. Clarke took a six month leave of absence from the band to try and clean up, but he died from an accidental overdose on January 8, 1991. Def Leppard hired ex Dio guitarist Vivian Campbell and released ''Adrenalize'', spawning several Top 40 singles including "Let's Get Rocked", "(Stand Up) Kick Love into Motion" and "Have You Ever Needed Someone So Bad". The album went to #1 in several countries.
** Leading into the recording of ''Slang'' guitarist Phil Collen went through a divorce, bassist Rick Savage was diagnosed with Bell's Palsy and lost his father, Rick Allen was arrested for spousal abuse and lead singer Joe Elliott was arrested for assault. They also split from producer Mutt Lange and embarked on a completely different recording process for the forthcoming album. Slang would feature less production in favor of a more organic sound. "We'd got so sick of recording the old way. We didn't want to do it any more. We wanted the music to be more personalized and let the character of the individuals to come out," explains Rick Savage. However the album flopped in the US (but did well in Britain) failing to achieve platinum status for the first time of any Leppard album. The band reunited with Lange to record ''Euphoria''. The lead single "Promises" re-ignited fans' faith in the band, going to #1, and the album followed suit. Since then Def Leppard has enjoyed good success for a band their age, including a successful long-term Vegas show.
* ChartDisplacement: Their sole #1 hit on the Hot 100 was "Love Bites", which isn't even the best-known song on ''Music/{{Hysteria|Album}}''. Because "Pour Some Sugar On Me" fell short at #2.
** They had five #1 hits on rock radio. Two of which were "Photograph" and "Rock of Ages". The other three songs came out in the 1990s, well after their peak in relevance.
* ExecutiveMeddling: Pressure from higher-ups resulted in a huge sum of money being paid to bring Music/JimSteinman in to produce ''Hysteria'', in spite of the band's protests that he was primarily a songwriter rather than a producer. Steinman later got fired and they reunited with their previous producer Creator/RobertJohnMuttLange.
* AGoodNameForARockBand: Joe Elliott came up with the name "Deaf Leopard" while designing fake concert posters for his art class. The drummer, Tony Kenning, suggested he change the spelling to make it sound "less like a punk band".
* ThePeteBest: Original drummer Tony Kenning was fired literally a week before the band recorded their first E.P. due to not wanting to commit to the band. Frank Noon, a friend who played for fellow local group The Next Band, filled in and was asked to join, but declined out of loyalty to his own band. Original guitarist Pete Willis was fired from the band just prior to ''Pyromania'', and thus wasn't able to share in the group's monumental 80s success. He does have some writing credit for ''Pyromania'', however.
* TroubledProduction: ''Hysteria'', partly due to Rick Allen's car accident, among other factors. ''Adrenalize'' as well, due to the death of Steve Clark. ''Slang'' had the band facing a lot of personal troubles; Collen got divorced, Allen and Elliot were arrested, Sav was diagnosed with Bell's Palsy and lost his father.
* WordOfGod: For a long time, there was heavy speculation among the fanbase as to how the instrumental "Switch 625" received its title. This led to a Fanon theory that June 25th was a date of personal significance to Steve Clark. The band would later clarify that they chose the numbers at random because it "sounded cool."
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