Many people sometimes affect the integrity of their singing due to imperfect processing of tail sounds. The management of the tail tone is closely related to the management of breathing, pitch, and timbre. Generally speaking, the management of tail sounds can be roughly divided into six types: rising, falling, sharp closing, crescendo, diminutive, and vibrato. Skilled singers will often combine and apply these six consistent types of tail tone management. Among them, Douyin's training is the most difficult to master, and it is also a skill that many people who love to sing continue to study. Many people think that Douyin is against the constant repetition of individual sounds. But it’s not true. Repeating the same sound will only make you make a sheep’s bleating sound or a cold trembling sound. Such words are not correct Douyin. The correct Douyin is two tones less than a semitone, alternating and changing regularly. And there are two types of Douyin, one is to change up, and the other is to change down. Singers will choose the type of Douyin based on the consistency of the music style, consistency of interpretation and personal habits. As for whether there are any arbitrary rules?! The answer is no! Singing is an art form of music. Since it is an art, there are no arbitrary rules. If there were rules and right and wrong interpretations of songs, how boring would singing become?! There are some very lucky people who are born with the skill of Douyin. But many people can also master Douyin's capabilities after training. Here we provide several exercises from easy to deep so that students can practice at home. Step 1. Manipulate your body to make the sound vibrate first. First, choose a sound at random and lengthen it. While making the long note, interlock your fingers and shake your hands back and forth, much like the movement of worship. Manipulate the shaking of the body to make Changyin tremble. Then start to express/analyze the feeling of Douyin, and then first understand what the correct Douyin feels like. This exercise usually only treats the symptoms, not the cause, but it's a good first-level exercise. Many times before we learn a skill, we need to know how it feels after learning it. Step 2. Practice "Cicada Exhalation". Before doing this exercise, you must first learn abdominal breathing. Students who don’t understand abdominal breathing may refer to the abdominal breathing exercises in Myth 4. Just like abdominal breathing, the abdomen will bulge when you inhale and make a hissing sound when you exhale. Then practice laughing while exhaling, so that your abdomen is relaxed and elastic. By this time you should be making a sound similar to the chirping of a cicada. Practice slowly until you make an average of 5 to 6 shaking hisses per second. Step 3. Use your fingers to help us visually. Just like Step 1, first make a long sound, and then use your fingers to draw a large wave. When the notes change up/down, follow the waves with your fingers to draw up/down. Start drawing with big waves, and gradually move faster and faster. At this time, the long notes you draw will follow your fingers and switch between two sound layers, one up and down from slow to fast, bringing out the vibration of the sound. The most difficult part of Douyin is to vibrate six times in one second. Practice slowly until it is almost completely controlled, then your Douyin is completed.