Regardless of the cultural background and place of the world, the existence of lullabies and the phenomenon of mothers singing to their children seem to be natural. This has been going on for thousands of years and the musical talents of mothers do not really play a fundamental role. What is the reason for this and what purpose does it serve? In fact, the answer to this question is not at all simple, but researcher Shannon de l'Etoile from the University of Miami has tried to provide one.