It plays over and over. You can't make it go away.
The first song that ever did that to me was "Tell Me a Story." It was on a kiddy record that my little sister owned. When she realized I didn't like it, she played it continuously. I hate it to this day and can sing all the verses.
I've had lots of songs run a continuous loop through my brain; mostly inane songs, advertising ditties, kids' songs, etc. Occasionally a song that I like will inhabit my head. By the time it moves on, I usually don't much like it any more.
Combating one of these songs can result in a Pyrrhic victory. Like the time I had " Never Been to Me" playing and drowned it out with the Oscar Meyer Wiener song. Which, of course, got stuck itself. If I did drugs or alcohol, I think I would have resorted to them -- heavily.
The most recent one to get stuck is 'Ricky" by Weird Al Yankovic. Why that one? I never loved Lucy. I always loathed Lucy.
Oops, maybe I just answered my own question.