If you've ever had "The Song That Never Ends" or "Copacabana" stuck inside your head and didn't know why....FINALLY the answer revealed:

A new study says that songs we like are the most likely to get stuck in our heads. Head researcher (no pun intended) Ira Hyman Jr. of Western Washington University and his colleagues exposed people to popular songs while asking them to complete various tasks.

Researchers found that songs usually get stuck in a person's head when they are doing a task that is either too difficult, or too easy. Difficult tasks cause the mind to wander, while easy thoughts create a mental opening for repetitive thoughts.

The research suggests we're most likely to get a song we like stuck in our heads, and to get a song un-stuck you should do something that engages the auditory and verbal components of your memory, like as reading a good book or watching a favorite show.