As the name suggests, "Yale" means "elegant music". Gagak is performed as venue music at approximately 100 ceremonies each year in Vietnam, including anniversaries and religious holidays, as well as special events (such as coronations, funerals or formal receptions).

From the 15th to the 18th century, Vietnamese monarchs devoted great enthusiasm to unifying various orchestral arrangements. Vietnamese court music began in the Hu Dynasty (1400-1407). At that time, a Vietnamese official established Vietnam's court music system with reference to the court music of the Ming Dynasty in China. He organized the following types of music, each of which Played on different religious and social occasions:

Suburban music: played as ceremonial music at the emperor's heaven-sacrifice ceremony every three years.

Temple Music: Played during court cultural ceremonies honoring Confucius and on every anniversary of the dead emperor.

Wuji music: It is Wuji music.

Sun and Moon Music: Music that helps the sun and moon defeat evil during a solar or lunar eclipse.

Popular music: music played for ordinary audiences.

Vietnamese music was on the verge of maturity during the Nguyen Dynasty (1802-1945 AD). Yale became an essential part of court rituals. The king of the Nguyen Dynasty supported Ga Le and allowed Ga Le to be officially used as court music, giving it a special status and confirming that it became a symbol of the power and longevity of a dynasty. The music system of Yale is based on the palace orchestra and features a variety of musical instruments. Gagaku musicians are required to maintain a deep mental state in order to concentrate on following the long ritual performances of the entire stage. Yale is also rich in spiritual content, such as paying tribute to gods and kings, and conveying philosophical ideas (such as Vietnam's theory of celestial evolution, etc.).

In a broad sense, elegant music not only revolves around the palace and is based on the five tones (gong, shang, jiao, zheng, yu), but also penetrates into the actual life of the Vietnamese people and has become the source of contemporary Vietnamese music.

There are formal music scores for court music. However, in its declining stage, the music score was seriously lost, and only the lyrics were passed down orally. The musical scores that have been preserved to this day include: Shibenyu (including legato in 10 sets of scores such as Pinxue, Yuanxiao, Hu Guang, Lianlian, Pingban, Ximei, Qianqian, Spring Breeze, Dragon and Tiger, and Zouma), Dragon Lantern, Dragon Yin, Fu Liu, Xiaoqu, Three Wheels and Nine Turns (a tune for praying for good weather), Dengtan Palace, Single Dengtan, Dual Dengtan, Taiping ancient music, Mianmiao tune, Mawu, Man tune and some chamber music, such as Nanping, Nanai, etc. .

The Nguyen Dynasty court orchestra also used a variety of tunes: Yale, Xuanle, Silk and Bamboo Ceremony Music, Xiaole, Dale, Guxiao Dale, Shao Music, Bayin, Silk End, Silk bed, Silk Gu et al. Today, Hue's court music has only small and large music preserved (most of the orchestras and music scores remain among the people), and court dances, along with accompanying instrumental music, vocal music, dance, chamber music, and folk ditties (have become folk songs). and tunes influenced by Hue folk) and ancient court dramas. However, ancient palace dramas were almost lost. Music scores, lyrics and related materials are yet to be collected and organized.

While developing the movements and performance methods of elegant music, the Nguyen Dynasty emperor paid attention to the construction of performance venues. At that time, there was the Yue Shi Tang (Vietnamese: Duy?tThng) in the Royal Palace, the Ming Qian Tang in the Du Duc Mausoleum, and even the Plum Garden Theater in the private residence of Tao Jin, the founder of Vietnam's theater industry.

In the 20th century, the chaotic events that rocked Vietnam—especially the monarchy and decades of war—seriously threatened Ga Le’s survival. First stripped of its palace form, this musical tradition has lost the significance of its original social function. The few remaining former court musicians now try to keep the tradition of Gagaku alive, and they want to pass on their skills to younger generations during their lifetimes. The charm of Yale lies in its unique musical instruments and unique melody, coupled with its unique performance method, which produces a unique solemn, solemn and elegant charm, making the audience feel a sense of reverence for God, memory of ancestors, and prayer for the future. Mystical feeling.

What I have to mention here is the historical fact: Yale has lasted for three thousand years in Chinese history, embodying the wisdom and creative spirit of the Chinese nation. It was as early as the Han and Tang Dynasties. It has spread to Japan, South Korea, Vietnam and other countries, and now Japan and South Korea have Yale Research Centers. In 2003, Vietnamese Yale was included in the oral and intangible cultural heritage of mankind, but Yale has been "dumb" in its hometown of China for more than 100 years.