Creepypasta or reality?

Most of you guys must have realized that I'm really into classical music.. But I have to say that there are some people that are way more than me.. WAY more INTO the music than me..
As an example, I could say Robert Schumann, a german virtuoso pianist who lived with his wife and was born in June, 8th 1810 and died in July 29th, 1856.
He wrote a lot of piano pieces and ahn.. let's just say thay probably TOO MANY, 'cause before he died he said to his closest friend (don't remember his name now) that he was listening the note "A" in EVERYWHERE that he went or in anything that he had to do..
Simple things like eating, listening to music and going out was impossible for him, because no matter where he went, that fucking note just followed him..
When he was elder already, he was admitted to a mental hospital, where he lived his last months and days of life listening to that fucking note, no matter what he did, it just wouldn't go away from his head.

So, backing on the title, what do u guys think, is this story a creepypasta or an evil, mad and rare disease that he got in reality?