Sejong the Great
Before the creation of Hangul, people in Korea (known as Joseon at the time) primarily wrote using Classical Chinese alongside phonetic writing systems based on Chinese script that predated Hangul by hundreds of years, including idu, hyangchal, gugyeol, and gakpil. However, due to the fundamental differences between the Korean and Chinese languages, and the large number of characters that needed to be learned, there was much difficulty in learning how to write using Chinese characters for the lower classes, who often lacked the privilege of education. To assuage this problem, King Sejong created the unique alphabet known as Hangul to promote literacy among the common people. His intention was to establish a cultural identity for Korea through its unique script.
Yeomillak
Yeominrak, which means "Enjoyment with the People", was created based on Korean court music that the king shared to his people to be enjoyed together. This song was created during his 29th year of reign (1447) and actually had lyrics from the Yongbi eocheonga, but only the melodic component is existent today. It is usually played on Hangul Day in South Korea to celebrate the promulgation of Hangul by King Sejong, and also in religious services for the Ancestral Shrine of the Royal family, honoring the Royal Court, and for the Civil and Military authorities.