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Pink Floyd's "Shine On You Crazy Diamond (Parts I-IX)" remains one of rock music's most enduring long-form songs, 51 years after the release of Wish You Were Here. The nine-part composition runs for 25 minutes and 57 seconds and was created as a tribute to the band's founding member, Syd Barrett.
Written by David Gilmour, Roger Waters and Richard Wright, the song first appeared in two sections on Pink Floyd's 1975 album. Parts I-V opened the record, while Parts VI-IX closed it, with other songs placed between the two halves.
The full nine-part version was officially brought together as one continuous track for the first time in the 2025 50th anniversary edition of Wish You Were Here. The new stereo mix was remixed by James Guthrie, giving listeners a complete version of the piece in one track.
The song's lasting place in rock history is tied not only to its length and musical scale but also to the story behind it. "Shine On You Crazy Diamond" was written about Barrett, who had left Pink Floyd in 1968 after his mental health declined and his ability to work with the band became increasingly difficult.
Barrett had been a key part of Pink Floyd's early years. He was the band's founding member and an important songwriter during its early psychedelic rock period. David Gilmour, who had been brought in as an additional guitarist, later replaced him in the group.
The song grew from a guitar riff by Gilmour and was developed by Gilmour, Waters and Wright. The band planned it as a tribute to Barrett, whose influence remained deeply connected to Pink Floyd's story.
The composition explores themes linked to fame, drug addiction, the search for meaning and Barrett's struggles with his mental health. Its nine sections move through long instrumental passages, guitar solos, keyboards, vocals, saxophone and shifting rhythms.
The recording process was also demanding. Pink Floyd had to record the backing track more than once after technical problems affected the first attempts. Gilmour explained that the band discovered an issue with the studio mixing console after recording, leaving them with no way to save the take.
The band eventually recorded the piece again, with the rhythm section facing the challenge of playing the long composition from beginning to end.
Nick Mason later recalled that the use of 16-track, 2-inch tape led the group to believe that editing such recordings was not practical. As a result, the musicians often had to perform the entire piece correctly.
The song was also notable for its place in the Wish You Were Here sessions. It was the first piece started for the album and the last one recorded.
Then came one of the most famous stories connected to the recording.
On June 5, 1975, Barrett unexpectedly arrived at Abbey Road Studios while Pink Floyd was working on the album. His appearance had changed so much that the band members did not recognize him at first.
According to Richard Wright, Barrett sat near Roger Waters while the group worked. It took Wright about 45 minutes to realize who the visitor was.
The timing of Barrett's visit became especially striking because the band was working on a song written about him. Waters was reportedly deeply upset by Barrett's changed appearance, and the meeting became part of the story surrounding the song and the album.
The account has been remembered by Pink Floyd members over the years, although Gilmour and Mason later said they could not be completely certain which part of the recording was being worked on when Barrett arrived.
When Wish You Were Here was first released in 1975, "Shine On You Crazy Diamond" was divided into two parts. The first five sections ran for about 13 and a half minutes, while Parts VI-IX continued later in the album.
The split was part of the album's structure. The song was originally imagined as a single, side-long work, similar to Pink Floyd's earlier extended compositions such as "Atom Heart Mother" and "Echoes." Instead, the band divided it into two halves that framed the rest of Wish You Were Here.
The complete recording eventually became available as one continuous 25-minute-and-57-second track in the 2025 anniversary release.
That version allows listeners to hear all nine sections together, following the full musical journey from the opening instrumental passages to the closing section written by Wright.
Part IX has been described by Gilmour as "a slow 4/4 funeral march... the parting musical eulogy to Syd." The ending also includes a fragment of "See Emily Play," one of Barrett's best-known songs with Pink Floyd.
The song has remained part of the band's live history as well. Pink Floyd first performed an early version during its 1974 French tour, before presenting it under the full title during the band's British tour later that year.
The group later performed versions of the composition on major tours, while Gilmour and Waters also included different arrangements in their solo performances.
Its continued presence in Pink Floyd releases and performances has helped keep the song in the public eye. In 2025, the anniversary edition of Wish You Were Here once again placed the complete nine-part composition at the center of attention.
The song also remains connected to the wider success of Wish You Were Here. In April 2026, the album returned to Billboard's Top Album Sales chart at No. 45, while The Dark Side of the Moon also returned to the Vinyl Albums chart. The renewed chart activity showed the continued demand for Pink Floyd's classic recordings decades after their original release.
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