 Barrett made a final public acknowledgement of his musical past in 2002 , his first since the 1970s , when he autographed 320 copies of photographer Mick Rock 's book Psychedelic Renegades , which contained a number of photos of Barrett . Rock was perhaps the last person in the music industry with whom Barrett kept in contact . In 1971 , Rock conducted the final interview of Barrett before his retirement from the music industry a few years later , and Barrett subsequently turned up on Rock 's London doorstep " four , maybe five times " for a cup of tea and conversation through 1978 , before Barrett moved back to Cambridge . They had not spoken in more than twenty years when Rock approached Barrett to autograph his photography book , and Barrett uncharacteristically agreed . Having reverted to his birth name " Roger " from his stage name " Syd " many years before , he had autographed the book simply " Barrett . " 
