On November 13, Def Leppard released The CD Collection: Volume 4, a six-CD box and the fourth instalment of a six-volume series gathering everything the band has recorded. It follows the 1980s (2018), the 1990s (2019) and the 2000s (2021), and collects all of their studio recordings from 2015 to 2023. The Japanese edition (UICY-80784/9, 14,300 yen including tax) came out the same day from Universal Music Japan, and an eleven-LP box on 180-gram vinyl is out elsewhere.

Discs one to three are Def Leppard, Diamond Star Halos and Drastic Symphonies — each in its original packaging

Discs one to three are Def Leppard (2015, 14 tracks), Diamond Star Halos (2022, 15) and Drastic Symphonies (2023, 15), the record made with the Royal Philharmonic Orchestra, each in its original packaging. They reached number 11, 5 and 4 on the UK albums chart. Ronan McHugh mastered all of the albums at Ro's Garage.

Discs four to six are 41 rarities chosen by Joe Elliott — the Beatles' "Revolution" was recorded for a TV advert that never used it

The 41 tracks on discs four to six are rarities chosen by singer Joe Elliott, many of them on CD and vinyl for the first time: six live sessions recorded for iTunes, three live tracks from Abbey Road in 2008, "Undefeated", "Kings Of The World" and "It's All About Believin'" from the live album Mirror Ball, the 2012-13 re-recordings of "Rock Of Ages", "Pour Some Sugar On Me" and "Hysteria", demos, radio edits and alternate mixes of songs from Diamond Star Halos.

Among the collaborations and covers are the 2024 single "Just Like 73" with Tom Morello, "Bad Motor Scooter" with Sammy Hagar and a Retroactive outtake of "Miss You In A Heartbeat" featuring Ian Hunter. Their cover of the Beatles' "Revolution" was recorded for a TV advert and never used, and came out ahead of the box on September 15. Joe Elliott says some of the bonus material is recent, while something else had been lost in the vaults for over 33 years until earlier this year.

A hardback book with Ross Halfin's photographs and interviews with all five members — the Japanese edition is on six SHM-CDs

The box comes with a hardback book of rare photographs by Ross Halfin, liner notes by Classic Rock's Paul Elliott, and interviews with Joe Elliott, Rick Savage, Rick Allen, Vivian Campbell and Phil Collen.

The Japanese edition (UICY-80784/9) is a limited pressing from Universal Music Japan on SHM-CD, with a full translation of the English liner notes, lyrics and translations. Its 85 tracks are the same as the international set's.

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