During the making of the album "Wish you Were Here," Syd Barrett came into the studio. When they eventually determined the withdrawn man in the corner was Barrett, Roger Waters became so distressed about Barrett's appearance he was reduced to tears.
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He came in as we were doing the vocals for "Shine On You Crazy Diamond", which was basically about Syd. He just, for some incredible reason picked the very day that we were doing a song which was about him. And we hadn't seen him, I don't think, for two years before.