Sound predates the existence of human beings. The so-called natural sound is one of the phenomena in nature. Music is the product of culture by the human mind's selective imitation of various natural sounds. Its different styles are obviously affected by various Restrictions on natural conditions. As far as musical instruments are concerned, the ancient cymbals were made of stone, and the drums required animal skins, all of which were derived from natural materials. As for the style characteristics of music, although many tunes are lost, they come from the retained lyrics. See, the styles are also very different. Folk songs of the North Dynasty are rough and open, and the folk songs of the South Dynasty are delicately turned. Once the Kunqu Opera from the south spread to the north, it was generous immediately. What does this text mean? ['Culture determines the characteristics and style of music.', 'The cultural nature of music does not mean that it can be separated from nature.', 'Music depends on nature, both in origin and development.', 'The atmosphere of the court cannot completely change the characteristics of music.']