The abbreviations are as follows:

1. POP: pop music.

The full name is Popular Music. Pop music originated in the United States at the end of the 19th century and the beginning of the 20th century. From the perspective of music system, pop music is music developed on the basis of American popular music structures such as jingle alley songs, blues, jazz, rock music, and sole music. It has various styles and rich forms.

2. CLASS: Classical music

Classical music originally refers specifically to German and Austrian music represented by Haydn, Mozart, and Beethoven from 1750 to 1830, that is, The music of the so-called "Vienna Classical School" (or translated as "Viennese Classical Music"). This is classical music in the narrow sense.

Classical music is music with a regular nature, characterized by balance and clarity, focusing on the beauty of form, and is considered to have lasting value, rather than just being popular in a specific era. This is also reflected in the difference between "classical" and "classic"

3. ROCK: rock music

Also known as rock music, referred to as rock, the full name in English is Rock and Roll (hereinafter referred to as rock music or rock music). It originated in the late 1940s and emerged in the mid-1950s, originating from the United States. Then it also began to appear and flourish in the UK.

Rock music is mainly developed under the influence of rhythm and blues, country music and jingle alley music. Many early rock music were covers of black rhythm and blues, so rhythm and blues was its main foundation. Rock music has many branches and complex forms. The main styles include: folk rock, art rock, psychedelic rock, country rock, heavy metal, punk, etc.

Rock music expresses emotions with its flexible and bold expressions and passionate music rhythm. It is loved by most people around the world and formed a craze in the 1960s and 1970s.

4. JAZZ: Jazz Music

The full name is JAZZ MUSIC. It originated from the United States in the late 19th and early 20th centuries and was born in the southern port city of New Orleans. Its musical roots come from blues and ragtag. Mu. Jazz pays attention to improvisation, is based on the shuffle rhythm with swing characteristics, and is a combination of black African culture and white European culture.

In the first dozen years of the 20th century, jazz mainly developed in New Orleans. After 1917, it moved to Chicago, and then to New York in the 1930s. Until today, jazz has become popular all over the world. The main styles of jazz include: New Orleans jazz, swing, bebop, cold jazz, free jazz, Latin jazz, fusion jazz, etc.

5. blues: Blues

American pop music form. Also translated as blue tone, that is, blues. The original meaning is to be emotionally sad. Most of the black songs describe the feelings of life and death, expressing sorrow and misery. The word blues is very appropriate to summarize. After using it for a long time, it became the general name of this type of black songs, and then became the name of black Americans. A typical tune in music.

6. Ballad: Ballads

Folk songs that are popular and give national color are called ballads or folk songs. Folk songs have a long history, so their authors are mostly unknown. Folk songs are rich in content, including religion, love, war, work, drinking, dancing and music, festivals, etc.

Folk songs express the feelings and customs of a nation, so each has its own unique scale and emotional style. For example, the exuberance of French folk songs, the enthusiasm of Italian folk songs, the simplicity of British folk songs, the sadness and indignation of Japanese folk songs, the wild and unrestrained Spanish folk songs, and the lingering pathos of Chinese folk songs all express strong national temperament and color.