1. Chorus is two or more groups of singers, each singing the same piece of music at the same time according to the tune of each group. Generally, choruses are accompanied by musical instruments or bands. Choruses without accompaniment are called "a cappella choruses". A chorus composed purely of female, male or children's voices is called "single chorus". A chorus composed of a mixture of male and female voices is called a "mixed chorus". According to the number of voices, it is also divided into two-part chorus for female voices, three-part chorus for female voices, four-part chorus for mixed voices, etc.

2. Solo singing is performed by one person, and any part can be sung solo. Singing is usually accompanied by one or several musical instruments, a band, or other people singing in unison or chorus.

3. Singing in unison is two or more singers singing the same song at the same time according to the same degree or octave interval. Mass songs often take the form of chorus singing.

4. The lead singer is a solo singer arranged at the beginning or middle part of the unison or chorus. Because the solo has the function of leading everyone to sing, it is called "lead singer". The soloist is also called the "lead singer" and can be played by one to several people. The lead singing form is often used in our country's folk collective labor songs, such as labor chants. Lead singing is also common in cantata and unison songs.

5. Duet is a reciprocal singing between two people. According to the different parts, it can be divided into: female duet, male duet, male and female duet, etc. There are also duets between two groups of singers.

6. Duet singing is two or more singers with different parts singing the same piece of music overlapping according to the melody of their own parts. According to the different parts and number of people, it can be divided into duet, trio, quartet, female duet, male duet, male and female duet, female quartet, male quartet, etc.

7. Round singing is when two, three or four voices sing the same melody, but it does not start singing in unison at the same time, but appears one beat or a bar apart one after another, forming one after another. Fall, continuous imitation effect. It is a multi-part music, in which each part sings the same melody, but also forms contrasting and intersecting effects. This form of round singing is commonly used in modern mass songs in my country. It is called "canon" in polyphonic music.

In addition, there is the concept of "cantata", which is a multi-movement vocal suite. It includes forms such as unison, duet, duet, chorus, and recitation. It is often accompanied by a band, and the content is epic and dramatic. It is often used to express major realistic themes, such as Xi Xinghai's "Yellow River Cantata" and so on. Cantata originated in Europe in the seventeenth century. In addition to the "cantata" abroad, there are also large-scale multi-movement vocal suites called "oratorios" and "cantata". Their content and form are similar to the cantata. In our country, they are collectively called cantata.