The Music Instinct: How Music Works and Why We Can’t Do Without It. By Philip Ball.

from the Economist:
His basic message is encouraging and uplifting: people know much more about music than they think. They start picking up the rules from the day they are born, perhaps even before, by hearing it all around them. Very young children can tell if a tune or harmony is not quite right. One of the joys of listening to music is a general familiarity with the way it is put together: to know roughly what to expect, then to see in what particular ways your expectations will be met or exceeded. Most adults can differentiate between kinds of music even if they have had no training.

Music is completely sui generis. It should not tell a non-musical story; the listener will decode it for himself. Many, perhaps most, people have experienced a sudden rush of emotion on hearing a particular piece of music; a thrill or chill, a sense of excitement or exhilaration, a feeling of being swept away by it. They may even be moved to tears, without being able to tell why. Musical analysts have tried hard to find out how this happens, but with little success. Perhaps some mysteries are best preserved.