"A haunting melody or earworm is a piece of music that sticks in one's mind so that one seems to hear it, even when it is not being played. Other phrases used to describe this include musical imagery repetition and involuntary musical imagery. The phenomenon is common in normal life and so may be distinguished from brain damage which results in palinacousis."
My own "case of the worm" started with "Caballero"...one of our ballroom line dance melodies. I tried everything to vanquish it. I'd get up in the middle of the night and dance in the dark living room to try and squelch it. I'd sing it out loud, or use my inside voice...nothing worked for days. When I mentioned "Earworm" in class, no one had heard of this word for the syndrome before.
Now there is every risk of it becoming Frosty the Snowman....Thumpity Thump Thump...
Photo Credit: The Web