“Jimmy Page” by dana wullenwaber is licensed under CC BY-SA 2.0.

Jimmy Page has shared an unreleased home demo for Led Zeppelin’s “Ten Years Gone” to his YouTube channel. The iconic guitarist’s unexpected offering continues the 50th-anniversary celebration of Physical Graffiti, their immortal 1975 album, which last year saw a deluxe reissue accompanied by a new live EP.

“As a footnote to Physical Graffiti, I thought you might like to hear the original home demo, recorded in my studio at Plumpton Place of a piece of music that was going to surface as ‘Ten Years Gone,’” Page wrote in the description for the legendary song’s remarkably fleshed-out early treatment. “I presented this rough mix to the band at Headley Grange in order to do this for real. Robert Plant came up with some lyrics for my music that were extraordinary and then we arrive at the song ‘Ten Years Gone.’”

Physical Graffiti was Led Zeppelin’s first release on their Swan Song imprint, which granted the band a new creative freedom they fully embraced with their first-ever double album. The 15 tracks that compile the record were a mix of new compositions–like the pummeling riffs of “In My Time of Dying” and “The Wanton Song” and radio-ready rough psychedelia of “Kashmir” and “Ten Years Gone”–and fine-tuned holdovers from previous sessions, like the loose and languid blues of “Down by the Seaside” from the Led Zeppelin IV sessions and tuneful acoustic bramble of “Bron-Yr-Aur” from the Led Zeppelin III sessions. Taken together, the sharply divergent tracks cohere as an expression of the group’s complex and evolving perspective, now widely regarded as a high point in their expansive catalog.

Hear Page’s home demo of “Ten Years Gone” below. Last year, Led Zeppelin’s early years were captured in the Becoming Led Zeppelin documentary, which later led to Page’s return to court with the original “Dazed and Confused” songwriter. Read more about that suit here.