Garfunkel's hit The Sound Of Silence topped the US charts and went platinum in the UK. It was named among the 20 most performed songs of the 20th century, included in Rolling Stone's 500 Greatest Songs of All Time, and provided the unforgettable soundtrack to 1967 film classic The Graduate. But to one man The Sound Of Silence means much more than just a No 1 song on the radio with its poignant opening lines: "Hello Darkness my old friend, I've come to talk with you again." Sanford "Sandy" Greenberg is Art Garfunkel's best friend, and reveals in a moving new memoir, named after that lyric, that the song was a touching tribute to their undying bond, and the singer's sacrifice that saved Sandy's life when he unexpectedly lost his sight. "He lifted me out of the grave," says Sandy, aged 79, who recounts his plunge into sudden blindness, and how Art Garfunkel's selfless devotion gave him reason to live again. Sandy and Arthur, as Art was then known, met during their first week as students at the prestigious Columbia University in New York. "A young man wearing an Argyle sweater and corduroy pants and blond hair with a crew cut came over and said, 'Hi, I'm Arthur Garfunkel'," Sandy recalls. They became roommates, bonding over a shared taste in books, poetry and music. "Every night Arthur and I would sing. He would play his guitar and I would be the DJ. The air was always filled with music." "Still teenagers, they made a pact to always be there for each other in times of trouble. "If one was in extremis, the other would come to his rescue," says Sandy They had no idea their promise would be tested so soon. Just months later, Sandy recalls: "I was at a baseball game and suddenly my eyes became cloudy and my vision became unhinged. Shortly after that darkness descended." Doctors diagnosed conjunctivitis, assuring it would pass. But days later Sandy went blind, and doctors realized that glaucoma had destroyed his optic nerves. Sandy was the son of a rag-and-bone man. His family, Jewish immigrants in Buffalo, New York, had no money to help him, so he dropped out of college, gave up his dream of becoming a lawyer, and plunged into depression. "I wouldn't see anyone, I just refused to talk to anybody," says Sandy. "And then unexpectedly Arthur flew in, saying he had to talk to me. He said, 'You're gonna come back, aren't you?' "I said,: 'No, There's no conceivable way.' "He was pretty insistent, and finally said, 'Look, I don't think you get it. I need you back there. That's the pact we made together: we would be there for the other in times of crises. I will help you'."