Pink Floyd will mark fifty years of Animals with a box set that reaches past the familiar. Animals 50, out January 22 via Sony, carries a previously unheard Roger Waters solo song, "Young Nicholas Jon," along with unreleased versions of "Sheep" and "Dogs." A radio edit of "Sheep" is available now. The package comes on CD, vinyl and download.

The archival centerpiece is a complete recording of the band's 1977 show at Oakland Coliseum Arena, filmed by Reinhard Hohlwein, who was a teenage bootlegger at the time. The set's 64-page book pairs liner notes by Jonathan Lethem with an interview with Hohlwein and an excerpt from Hipgnosis designer Aubrey "Po" Powell's memoir about making the album's cover, the inflatable pig adrift above Battersea Power Station. Unpublished photographs from the sessions, the cover shoot and the tour fill out the book.

David Gilmour, in press materials, places the record against its moment: "The mood in music was changing in '77. Punk music was hitting everything and I suspect that had a little bit of an influence on the way we were working on the Animals album. I mean it's quite an aggressive, stripped-back album." He describes it as a turn from the sprawl of Wish You Were Here: "This album is more in your face and more rough and ready."

That roughness had an address. Animals was the first Pink Floyd album made at Britannia Row, the studio the band bought in 1975, and the record's lean, hostile sound bears the mark of a group working in its own rooms with no one to answer to. The reissue follows last year's fiftieth-anniversary edition of Wish You Were Here, and it lands four years after the Animals 2018 Remix, which revisited the album's mix without opening the vaults.

The vaults are open now. Waters has spent recent years reworking Pink Floyd material in public, from his "Comfortably Numb" rewrite with a Palestinian vocalist to a tour of Floyd songs with Harry Waters as musical director. "Young Nicholas Jon" is something else: a Waters composition from the period that has stayed unheard for half a century, arriving beside the band's own outtakes. Listen first to how it sits against "Sheep" and "Dogs," whether it sounds like a sketch that escaped the album or a song that never found its room.

The Oakland tape matters for a different reason. By 1977 the Animals material had turned the tour into something tense, and a fan's camera caught it from the floor. Hohlwein's footage is the document the box set was built around.