Nursery rhymes often bring back fond memories of childhood. Your parents probably recited many nursery rhymes to you because they are fun to say and sound entertaining.
Most cultures have invented some form of rhyming ditties that have been passed down through the generations.
Dating from as early as the Middle Ages, rhymes and songs were an important part of oral-based societies (not much was written down) as a way of relaying news about current events, scandal and gossip, spreading rumours about authority figures, working out problems and exploring aspects of daily life.
Mary had a little lamb
1. Australia (Wallabies) played New Zealand (All Blacks)