"Shine On You Crazy Diamond" is a nine-part Pink Floyd composition written by David Gilmour, Roger Waters, and Richard Wright, which was first performed on Pink Floyd's 1974 French tour and appeared in Pink Floyd's 1975 concept album Wish You Were Here. The song is written about and dedicated to founder member Syd Barrett, who departed from the band in 1968 after dealing with mental problems and substance abuse.

David Jon Gilmour is an English singer, songwriter and guitarist who is a member of the rock band Pink Floyd. He joined in 1967, shortly before the departure of the founder member Syd Barrett. By the early 1980s, Pink Floyd had become one of the highest-selling and most acclaimed acts in music history. Following the departure of Roger Waters in 1985, Pink Floyd continued under Gilmour's leadership and released three more studio albums.