Book excerpt: There is much music in our lives -yet we know little about its function. Music is one of man's most remarkable inventions - though possibly it may not be his invention at all: like his capacity for language his capacity for music may be a naturally evolved biologic .function. All cultures and societies have music. Music differs from the sounds of speech and from other sounds, but only now do we find ourselves at the threshold of being able to find out how our brain processes musical sounds differently from other sounds. We are going through an exciting time when these questions and the question of how music moves us are being seriously investigated for the first time from the perspective of the co-ordinated functioning of the organism: the perspective of brain function, motor function as well as perception and experience. There is so much we do not yet know. But the roads to that knowledge are being opened, and the coming years are likely to see much progress towards providing answers and raising new questions. These questions are different from those music theorists have asked themselves: they deal not with the structure of a musical score (although that knowledge is important and necessary) but with music in the flesh: music not outside of man to be looked at from written symbols, but music-man as a living entity or system.