Broken recorder.

Listening to songs which goes AGAIN and AGAIN and AGAIN, GEE GEE GEE and SORRY SORRY SORRY really gets into your receptors then off to your nerve impulses up to your brain.
These were the reason why they chose these kind of songs, cos you will never get rid of the tune in your head.
Its like a broken recorder which plays the same words and harmony over again.
No point saying you won't like it cos it WILL get into your head later on. :)