The article seems to conclude that these phenomena are just particularly vivid memories or something--they aren't terribly clear--instead of a symptom of schizophrenia.
The interesting thing about this is its potential implications regarding composers and creativity. Composers who talk about this sort of thing, and most don't, say things like "it just came to me" or, as Bob Dylan described it:
“I’m not that serious a songwriter,” he says, a smile on his lips. “Songs don’t just come to me. They’ll usually brew for a while, and you’ll learn that it’s important to keep the pieces until they are completely formed and glued together…I’m not thinking about what I want to say, I’m just thinking ‘Is this OK for the meter?’ “But there’s an undeniable element of mystery too. “It’s like a ghost is writing a song like that. It gives you the song and it goes away, it goes away. You don’t know what it means. Except the ghost picked me to write the song.”Don't take that first part too seriously, but the bit about the ghost is interesting. I have had the experience many times of having a motif or whole passage just come to me, often in the shower. I keep humming it to myself until I can get to the computer! But, in the case I am thinking of, the working out of the whole composition just started with that. The ending was particularly difficult and to date I have re-written it six times!
But what interests me here about that story is that, while they talk a lot about hearing phantom voices, there is also the phenomenon of hearing phantom melodies or instruments. Composers, as I said, don't like to talk about this, but I wonder if sometimes an auditory phantom might have been the seed from which a piece of music grew?
But a seed is just a seed: all that growing and developing needed to turn it into a full-fledged piece of music is what the craft and art of composition is all about.
One of the most famous examples is the story behind the song "Yesterday" by Paul McCartney. He woke up one morning and the whole tune was just there, in his head. So he went to the piano and worked out the chords for it. For a long time he thought that it was a tune he had heard somewhere, but everyone he played if for denied knowing the tune. It just sat there for quite a while with the title "Scrambled Eggs" because he didn't have any lyrics for it. But finally he came up with the lyrics and voilá: "Yesterday". Part of the genius was definitely finding the right bittersweet lyrics to go with the melody. Oh, and there are something like 2500 cover versions of this song, which makes it one of the most popular ever written: