Wish You Were Here (Pink Floyd album) tribute to Pink Floyd founder Syd Barrett, who left seven years earlier due to mental health problems. As with their previous album "The Dark Side of the Moon" (1973), Pink Floyd used studio effects and synthesizers, and brought in guest singers: Roy Harper, who provided the lead vocals on "Have a Cigar", and Venetta Fields, who added backing vocals to "Shine On You Crazy Diamond". "Wish You Were Here" topped record charts in the United Kingdom and the United States, and Harvest Records' parent company EMI was unable to print enough copies to meet demand. Although it initially received mixed
Wish You Were Here (Pink Floyd album) his place, but declined, and eventually colleague and friend Roy Harper was asked to stand in. Harper was recording his own album in another of Abbey Road's studios, and Gilmour had already performed some guitar licks for him. Waters later regretted the decision, believing he should have performed the song. The Blackberries recorded backing vocals for "Shine On You Crazy Diamond". The band played much of "Wish You Were Here" on 5 July 1975 at the Knebworth music festival. Roy Harper, performing at the same event, on discovering that his stage costume was missing, proceeded to destroy one of Pink