text: Von Bülow perceived the 4th Prelude as 'Suffocation', the 10th as 'The Night Moth' and, even more amusingly, the 9th as a 'Vision' in which "..Chopin has the conviction that he has lost his power of expression. With the determination to discover whether his brain can still originate ideas, he strikes his head with a hammer… one can hear the blood trickle..".