What are two things that make humans different from animals? One is language and the other is music. It's true that some animals can sing. However, the songs of animals like birds are very limited. It's also true that humans, not animals, have developed musical instruments.
Music is a strange thing. It's clearly distinct from language. However, people can use music to communicate things - especially their emotions. When music is combined(组合) with speech in a song, it's a very powerful form of communication.
If music is truly different from speech, then we should process music and language in different parts of the brain. The scientific evidence suggests that this is true. For example, Vissarion Shebalin, a Russian composer, had a stroke(中风) in 1953. It injured the left side of his brain. He could no longer speak or understand speech. He could, however, still compose music until his death ten years later. On the other hand, sometimes strokes cause people to lose their musical ability, but they can still speak and understand speech.
By studying the physical effects of music on the body, scientists have also learned a lot about how music influences the emotions.
