Editing Def Leppard (section)

===''Euphoria'', ''X'', and ''Yeah!'' (1997–2007)===
{{main|Euphoria (Def Leppard album)|X (Def Leppard album)|Yeah! (Def Leppard album)}}

[[VH1]] revived the band's fortunes in the US in 1998 by featuring them on one of the first episodes of ''[[Behind the Music]]''. Re-runs of the episode yielded some of the series' highest ratings and brought the band's music back into the public consciousness (following years of burial by the alternative rock climate). The episode was even parodied on ''[[Saturday Night Live]]''. In an effort to capitalise on this new momentum, Def Leppard returned to its classic sound with the 1999 album ''[[Euphoria (Def Leppard album)|Euphoria]]''. The first single, "[[Promises (Def Leppard song)|Promises]]", reunited the band with Mutt Lange and hit the US Mainstream Rock Track charts at No.&nbsp;1 for three weeks although it did not receive much play on Top 40 radio; it was also a moderate hit in the UK and Canada. ''Euphoria'' peaked at No. 11 in both the UK and US, and at No 14 in Germany, although it was less successful in Canada and Australia.

[[File:Def Leppard - Wolverhampton 190203 (11) (6832397247).jpg|thumb|right|Def Leppard performing in [[Wolverhampton]] in February 2003.]]
On 5 September 2000, Def Leppard were inducted into [[Guitar Center#Hollywood's RockWalk|Hollywood's RockWalk]] on [[Sunset Boulevard]] by their friend [[Brian May]] of [[Queen (band)|Queen]].<ref>{{cite web | title = List of all the rockwalk/inductees | publisher = Guitar Center's Hollywood Rockwalk | url = http://www.rockwalk.com/inductees | access-date = 13 December 2018 | archive-date = 28 September 2010 | archive-url = https://web.archive.org/web/20100928050734/http://www.rockwalk.com/inductees/ | url-status = dead }}</ref> In 2001, VH1 produced and aired ''Hysteria – The Def Leppard Story'', a biopic that included [[Anthony Michael Hall]] as Mutt Lange and [[Amber Valletta]] as Lorelei Shellist (Steve Clark's girlfriend). The docudrama covered the band's history between 1977 through 1986, recounting the trials and triumphs of Rick Allen and Steve Clark.

Def Leppard's eighth album, ''[[X (Def Leppard album)|X]]'', saw the band's musical direction moving more towards pop and further away from the band's hard rock roots. ''X'' ultimately became the band's least successful release, peaking at No. 11 on the US ''Billboard'' 200.<ref>{{cite web|url = {{AllMusic|class=artist|id=p4062|pure_url=yes}}|title = Allmusic (Def Leppard charts and awards) Billboard albums}}</ref> No. 14 on the UK Albums Chart,<ref>{{cite web|url=https://www.officialcharts.com/artists/|title=Artists|website=Officialcharts.com}}</ref> No. 12 in Canada, and No. 19 in Germany. Its first single, "[[Now (Def Leppard song)|Now]]", reached the Top 30 in the UK and Canada but missed the US Hot 100, only reaching No. 26 on the US Mainstream Rock Tracks chart.

An expanded and updated best-of collection, ''Best Of'', was released internationally in October 2004. The North America-only version, ''Rock of Ages—The Definitive Collection'', was released the following May. Def Leppard participated at the [[Live 8]] [[Live 8 concert, Philadelphia|show in Philadelphia]] and toured in the summer with [[Bryan Adams]]. In 2005, the band left their long-time management team, Q-Prime, and signed with HK Management.<ref>{{cite news |title=Def Leppard Part Ways With Longtime Management |url=http://www.blabbermouth.net/news/def-leppard-part-ways-with-longtime-management/ |access-date=27 March 2019 |work=Blabbermouth}}</ref>

On 23 May 2006, Def Leppard released an all-covers album titled ''[[Yeah! (Def Leppard album)|Yeah!]]''. The disc pays homage to classic rock songs of their childhood, originally recorded by [[Blondie (band)|Blondie]], [[The Kinks]], [[The Sweet|Sweet]], [[Electric Light Orchestra|ELO]], and [[Badfinger]] among others. Their cover of "[[How Does It Feel (Slade song)|How Does It Feel]]" by [[Slade]] was used as a non-album B-side. It debuted at No.&nbsp;16 in the US, their tenth consecutive Top&nbsp;20 album.<ref name="BillboardAlbumChart"/> The band toured to promote the album with [[Journey (band)|Journey]] from June through November 2006 in Europe, the UK, and the US.<ref>{{cite web |title=Def Leppard YEAH! Tour 2006 (Dates/Setlists) |url=http://www.deflepparduk.com/tour2006.html |website=Def Leppard Tour History |access-date=7 December 2023 |archive-url=https://web.archive.org/web/20231207152500/http://www.deflepparduk.com/tour2006.html |archive-date=7 December 2023 |url-status=live |language=en}}</ref>

The band, along with [[Queen (band)|Queen]], [[Kiss (band)|Kiss]], and [[Judas Priest]], were the inaugural inductees of [[VH1 Rock Honors]] on 31 May 2006.<ref>{{cite magazine|last=Cohen|first=Jonathan|date=6 April 2006|url=http://www.billboard.com/articles/news/58826/vh1-rock-honors-to-salute-kiss-queen|title=VH1 Rock Honors To Salute Kiss, Queen|magazine=Billboard|access-date=23 December 2017}}</ref> During the show, [[The All-American Rejects]] paid homage to the band with a cover of "Photograph". Soon afterwards, they embarked on a US tour with Journey. That October, ''Hysteria'' was re-released in a two-disc deluxe edition format, which combined the original remastered album with B-sides, remixes, and bonus tracks from single releases. Def Leppard began their Downstage Thrust Tour, on 27 June, which took them across the US and into Canada.<ref>{{cite news |title=Def Leppard: 'Downstage Thrust Tour' Opening Night Setlist Revealed |url=http://www.blabbermouth.net/news/def-leppard-downstage-thrust-tour-opening-night-setlist-revealed/ |access-date=28 March 2019 |work=Blabbermouth}}</ref>