A quick Google search: "The perpetual music track is a new concept that describes a condition of constant or near-constant musical imagery." In other words, people who have this condition always have a song in their head.

What do you think of this concept? Do you know more information about it? Do you experience this? If so, when did it start? Do you play a musical instrument?

I found a thread on Reddit where the OP said this was linked to his ADHD, so that's kind of interesting.

I have constantly had music in my head for as long as I can remember. When I was younger I thought it happened to everyone. Sometimes it's a musical phrase or a chorus looped over and over again. Other times it's symphonic music I have never heard before. I'm not talking about temporarily having a song stuck in my head -- it's nonstop music. I'm curious to hear about others' experiences/opinions