Madame Blavatsky, founder of the Theosophical Society in 1875, well known for her works on the occult, including The Secret Doctrine and Isis Unveiled, also wrote some horror stories. These were evidently based on her nightmares. I just read The Ensouled Violin, expecting something mysterious and beautiful, but found a gruesome story of violinists achieving heights by using the intestines of loved ones as violin strings!
The story narrates that it was rumoured that Paganini’s brilliant playing was due to this. ‘Exaggerated as this idea may seem to some, it has nothing impossible in it.’ How the young violinist Franz Stenio, emulates this rumour, and how it ends in disaster, forms the rest of this horror story, which evidently draws on another, The Violin of Cremona.
The Ensouled Violin is available online, though I don’t recommend it.