Did you know the song "Happy Birthday to You" is copyrighted? That crappy little song that everyone sings to their niece while she contemplates jamming her fist into the cake is actually something that creates a revenue stream for the descendants of Mildred and Patty Hill who were nursery school teachers. Even though the song contains only six words (one of which is supplied by the singer) it is still complex enough to be considered intellectual property. That's the reason Chuck E. Cheese created their own song to use at birthday parties.
While this might be news to you, I think Oklahoma City resident Charles Syrus is familiar with this anecdote.