A dream was the source for one of the greatest musical pieces ever.
https://www.youtube.com/watch?v=z7rxl5KsPjs&list=RDz7rxl5KsPjs&start_radio=1
“One night I dreamed I had made a pact with the devil for my soul. Everything went as I desired: my new servant anticipated my every wish. I had the idea of giving him my violin to see if he might play me some pretty tunes, but imagine my astonishment when I heard a sonata so unusual and so beautiful, performed with such mastery and intelligence, on a level I had never before conceived was possible. I was so overcome that I stopped breathing and woke up gasping. Immediately I seized my violin, hoping to recall some shred of what I had just heard; but in vain. The piece I then composed is without a doubt my best, and I still call it “The Devil’s Sonata,” but it falls so far short of the one that stunned me that I would have smashed my violin and given up music forever if I could but have possessed it.”
“One night I dreamed I had made a pact with the devil for my soul. Everything went as I desired: my new servant anticipated my every wish. I had the idea of giving him my violin to see if he might play me some pretty tunes, but imagine my astonishment when I heard a sonata so unusual and so beautiful, performed with such mastery and intelligence, on a level I had never before conceived was possible. I was so overcome that I stopped breathing and woke up gasping. Immediately I seized my violin, hoping to recall some shred of what I had just heard; but in vain. The piece I then composed is without a doubt my best, and I still call it “The Devil’s Sonata,” but it falls so far short of the one that stunned me that I would have smashed my violin and given up music forever if I could but have possessed it.”