It's an enigma,isn't it?I mean almost everyone listens to music of some kind,and everyone understand it.you don't have to be a musical expert to know when a piece of music is sad or when it's happy.It doesn't even seem to matter what culture you come form.Everyone responds to music in some way or other,Even more than the visual arts,I think.But then I would say that.I teach music at a local school!