Music, water, comfortable room, mattress, pillows.

It is impossible to examine exactly when music began to exist in human society. But as early as before humans developed language, they already knew how to express their thoughts and feelings using the strength and weakness of sounds. With the development of human labor, chants to unify the rhythm of labor and shouts to convey information to each other gradually emerged. This is the most primitive prototype of music: when people celebrate harvests and share the fruits of labor, they often knock stone and wooden tools to express their feelings. Feelings of joy and joy.

Water is an inorganic substance composed of hydrogen and oxygen. It is non-toxic and drinkable. It is a colorless and odorless transparent liquid at normal temperature and pressure. It is called the source of human life and an important substance for sustaining life. It is also called hydrogen oxide. Water is one of the most common substances on Earth, with 71% of the Earth's surface covered by water.

Room is a Chinese word that means a unit in a house. A building, a shelter, or a unit inside a house separated by walls or boards.

Pillow, a sleeping tool. It is generally believed that pillows are fillers used by people for sleeping comfort. According to modern medical research, the human spine is a straight line when viewed from the front, but has four physiological curves when viewed from the side. In order to protect the normal physiological curvature of the neck and maintain normal physiological activities during sleep, pillows must be used when sleeping.