You have had it happen to you. Your least favorite song is stuck in your head for days, tormenting you, causing loss of sleep, making you want to tear your hair out. It happens to me quite frequently.
It has come to my attention that this is due to a glitch in the auditory cortex (the part of the brain that processes sounds and stores them for remembering later). This cortex has an itchy trigger finger and can put a painful musical cap in your ass with replay of your least favorite tunes after only a few notes.
This just proves that my brain hates me. It likes to taunt me with Hall and Oates, Celine Dion, etc. I don't even have to be at work for this to happen because most retail stores use similarly programmed music. The theory is that enjoyable relaxing music makes you want to stay in the store and spend money. I reject the music selections provided by the retail industry as most of them cause me mental pain and ruin my shopping experience.
There is actually a simple solution. This glitch can be overridden by either listening to the entire song or doing mathematical computation. This cortex will forget the damning song if you do math. I am going to try math the next time I am tortured because the thought of listening to the entire boat song (My Heart Will Go On by Celine Dion) makes me want to throw up.....