It can be very bothersome when a song gets stuck in your head and you cannot resist yourself from humming it all the time. Things get more disturbing when you lose your concentration and focus. Sometimes we cannot even recall when we heard the song or where but still the same lines repeat themselves in our mind. Funnily this happens more when we need to concentrate on some hard task. Such a bugging song is aptly referred to as an earworm. There are many theories regarding this strange phenomenon that may persist for days.
