When I was a child, I once read about a boy who heard music in his head. His parents feared something was wrong with him and took him to a doctor, who gave him pills to make the music go away. That's always stayed with me. It seems so strange and sad that parents would want to do that.
Almost every day, I wake up with a certain refrain, a line or two maybe, from some song in my head. Sometimes it's the same one a couple of days in a row, but it's usually different every day. Many do repeat over time, though and it is sort of like a barometer of my day.
From time to time, I consider writing the jingle-jangle down each day and see if over time, it adds up to some sort of revelation. Kind of like Tom Hanks and the DaVinci clues but without all the running around from statue to statue.