Serge Rachmaninov’s Second Piano Concerto might never have seen the light of day had it not been for hypnosis: before the twenty-seven-year-old composer began work on it, he was on his last legs – financially, artistically and psychologically. Dr Nikolay Dahl hypnotised his patient every day, whispering to him: ‘You will write your concerto. You will work with great fluency.