Rock is so respected by the subjects of his photography that in 2001, when his book "Psychedelic Renegades" was being published, he was successful in convincing Syd Barrett to personally autograph a special series of 320 books. Barrett had left the music business for good in 1974, had lived privately ever since, declining all interview requests and all contact with any of his fans or people from the music industry, and was notable for intensely disliking being reminded of his previous music career.