This is because your lip control is not enough, which leads to trembling whistle and unstable voice. It is recommended to practice your lip muscles and control them more.

Let me tell you a good way to practice your lips. You can try.

Section 1: Lip massage. Pinch the muscles on both sides of the upper lip with your forefinger, and rotate "massage" (knead) clockwise or counterclockwise for 8 times. Then press the muscles on both sides of the lower lip with two index fingers, and rotate them clockwise or counterclockwise in the same direction for 8 times before and after rubbing.

Section 2: Close your lips and let your mouth expand, contract, expand and contract again, just like swallowing food. At the same time, open the pharynx and roar department, like making an "ah" sound, but making no sound. Repeat 16 times.

The third section: close your lips and pout, then the corners of your mouth shrink inward and let your lips move back and forth repeatedly. Then the upper lip wraps the lower lip, and then the lower lip wraps the upper lip, alternately. Do the above actions 16 times. Finally, the upper teeth scrape the lower lip and the lower teeth scrape the upper lip, crossing each other 16 times.

Lip training focuses on the flexibility of lip muscles and the adjustment function of the damper (lip) to strengthen the adaptability of lip muscles and oral and laryngeal muscles to music. This is a time-saving, labor-saving and effective method. After a long time, it can freely adapt to the needs of all kinds of music.

I hope my answer can help you.

Music and composition technical team filament cold