The following people are not suitable for learning vocal music:

1. People with severe respiratory diseases, such as chicken breast, pneumothorax, rickets, etc.

2. Patients with vocal cord diseases, such as vocal cord congestion, vocal cord nodules, glottis asymmetry, vocal cord swelling and atrophy, etc.

3. Patients with abdominal lesions, such as abdominal bloating, small intestinal hernia, etc.

4. The hyoid bone and thyroid cartilage merge, the jaw muscles are excessively tense, or the lymph glands are swollen, tumors, etc.

5. People with severe rhinitis, extremely severe nasal septum deviation, swollen lymph nodes on the pharyngeal wall and other facial features problems.

Vocal music refers to the form of music sung with the human voice. Vocal music is a pleasant, continuous and rhythmic sound that is mainly produced by the human vocal cords, working with the mouth, tongue, and nasal cavity to act on the breath. According to the difference in pitch range and timbre, it can be divided into soprano, mezzo-soprano, alto and tenor, baritone and bass. The range of each human voice is approximately two octaves.

Vocal music is an art form that expresses music through the human voice. It is not only a pure musical performance, but also a cultural and artistic expression. The origins of vocal music can be traced back to ancient times, when people expressed their emotions and thoughts through singing. In Europe, the development of vocal art reached its peak, and many famous composers and singers contributed to the development of vocal art.

Several common forms of vocal singing:

1. Solo singing: Solo singing refers to the form of a person singing a song alone. Solo singing occupies an important position in vocal performance. It requires singers to have high vocal skills and expressiveness, and to be able to fully express the emotions and thoughts of the song through their own voices.

2. Chorus: Chorus refers to a group of people singing multi-part songs at the same time. Chorus requires coordination between the various parts, and the sound is harmonious and unified, which can produce a strong harmonic effect and create a sacred, solemn, warm and other emotional atmosphere.

3. Opera: Opera is a form of musical drama with singing and music as the main means of expression. Opera has a variety of singing forms, including arias, recitatives, duets, etc., which require singers to have high performance abilities and voice skills to create colorful musical images.

4. Musical: Musical is a comprehensive musical performance form that combines music, dance, drama and other elements. The singing form of the musical has a pop music style, which requires the singer to be able to express the characters' emotions and personality through music, and at the same time, they must have good dance skills and performance abilities.