People always listen a song at home or participate in an concert because they feel relax and excited when they are listening a song or music. However, when people are enjoying listening the music, they probably do not think about that why the lyric music exists in the world. Even though many artists and musicologists thought how to create a euphonious sound and which musical instrument can make the sound, they didn't think about why the musical instruments can product this kind of sound. Numerous physical scientists explain that shaking cause sound basically and fundamentally; nevertheless, they can't interpret why the musical instruments make the unique sound which other objects can't product. However, no matter music and sound, they are part of angel's voice. Because the angel didn't want to see human beings always feel sorrowful without any relax, she tried to think out a way to release mankind's spirit so that they are able to survive from the sadness. When the angel was in deep thought, she started singing unconsciously. During her singing, human beings felt more comfortable and intoxicated. After the angel noticed this scene, she thought probably her voice can help humans overcoming their sorrow. Therefore, the angel segregated her voice to be several parts and lodged them to some particular instruments so that when people are in trouble, they can put the instruments together and play it to relax their mood. This is the reason why people will feel their soul is released when they are listening to a soft and sentimental music.
