-Take the middle-class song "Little Baby Sleeps" as an example. Xu Lin's rhythm is the pulse of music, the essence of music, one of the core elements of music and the source of music vitality. Without rhythm, there is no music. All musical activities are inseparable from the sense of rhythm, which is an important part of musical ability, so it is very necessary to improve children's musical quality and ability and master the sense of rhythm. Rhythm is an important source of experiencing the beauty of music. It is full of life, emotion and meaning, and it is not just a teaching relationship. Next, I will take the song "Baby Fell asleep" in the middle class as an example to talk about how to master the rhythm of triple time. Music rhythm should be felt through body movements. Action plays an important role in children's feeling of music rhythm, and music is mainly expressed through sound, speed and strength. However, it is difficult for children to feel the content expressed by these means of expression only by hearing. Therefore, when mastering the sense of rhythm, it is necessary to have the participation of body movements to guide children to observe that many actions of the human body contain a strong sense of rhythm and feel that body movements can express the sense of rhythm. "Baby Sleeps" is a song with three beats. It is still difficult for children in the middle class to master the rhythm of triple beat. How to make children master the rhythm of triple beat in the quiet, peaceful and warm mood and atmosphere of lullaby is the difficulty of this lesson. In the first study, we asked the children to observe how I put them to sleep. This leads me to film the baby sleeping, so how should I film it? It is different to guide children to observe the action of patting their babies. Some are high, some are low. How many times when you are high, and how many times when you are low? Through a series of questions, guide children to master the rhythm characteristics of three beats, which are weak and light. In the second study, we found that it was too simple to pat the baby in one place while sleeping. In order to improve children's interest in learning, we designed such a question: "Where can I pat my baby while sleeping?" Guide children to pat their babies from different positions to stimulate their interest in learning. The children patted the baby's back and began to pat the baby's feet and arms ... so that while exploring and practicing, the children were extremely happy. Various forms of three-beat rhythm exercises not only stimulate children's interest in exploring and participating in activities, but also consolidate their mastery of three-beat rhythm. At the same time, new problems have emerged: after mastering the triple-beat rhythm, children are out of touch with music because they overemphasize the characteristics of the triple-beat rhythm, don't listen to music, only care about patting the baby, and stay away from the original intention of letting children feel and appreciate the warm and quiet mood of music. How to let children master the rhythm of triple beat while listening to beautiful lullabies? Interest is the best teacher, and the activity that children are most interested in is games. Therefore, it is self-evident to integrate the sense of rhythm into the game and stimulate children's interest with gamification methods and means. Although children themselves don't understand "rhythm", they have been able to feel and understand rhythm in imitation and have a strong interest in rhythm. So as to lay a good foundation for further mastering the sense of rhythm. In the third study, we guide children to observe how the stars sleep by showing them courseware. The child replied, "The stars sleep slowly with their eyes closed." At this time, let the children master the rhythm of three beats through small hand games. "Now our little hands have become stars. "See how he sleeps? Let the children follow suit. When children basically master the rhythm with their hands, guide them to express the rhythm with all parts of their bodies. When using body movements to express rhythm, we must pay attention to let children play freely and avoid letting children imitate blindly. If the child has uncoordinated movements, he should guide himself to adjust himself in time to achieve the coordination and unity of body and rhythm. After the children master the rhythm of triple beat, we play the role of "mom and dad", let the children put their babies to sleep in music, and let them experience the rhythm and the strength of body movements with the music, which requires the movements to be consistent and harmonious with the music. Rhythm serves the study of music, and the beauty of music can not be sublimated by rhythm alone. Therefore, combining rhythm with songs can not only improve children's understanding of the speed of songs, but also enhance children's understanding and experience of music. It can be seen that the rhythm ability has been improved, and the children's ability to express beauty and feel beauty has been strengthened, which is more conducive to promoting the harmony of children's body and mind.