According to UNESCO.org, migration is the “crossing of the boundary of a political or administrative unit for a certain minimum period of time. It includes the movement of refugees, displaced persons, uprooted people as well as economic migrants.” Besides, internal migration refers to the movement of people from one location to another in the country. On the other hand, international migration is the relocation of people across different countries. Throughout the U.S. musical history, I propose the Great Migration, which occurred between 1916 and 1970 as a significant historical moment that has impactful musical influence, especially on blues and jazz. The Great Migration is the relocation of around six million African-Americans out of the rural Southern U.S. to the urban West, Midwest, and Northeast. As a consequence, African-American voters become a significant force in the politics. In the context of social impacts, the large scale of migration exacerbates existing social tensions in the country. However, migrants incorporate valuable diversity into the American community and culture.Having escaped from the racial discrimination, African-Americans are able to seek inspiration and discover various kinds of creativity. During the 1920s and 1930s, the Harlem Renaissance, which was resulted in the Great Migration played a major influence on blues music. To escape racism, influential blues singers namely Chester Burnett migrates from Mississippi to Chicago. As a result, Mississippi blues music style greatly impacts the Chicago blues. This blues music style can be distinguished by the use of harmonica, bass, electric guitar, drums, and a rhythm section. Furthermore, blues shifts from being a rural country music to being played in clubs and modern places. The blues rhythm and style then become upbeat as African-Americans attain freedom in urban cities.In addition, the Great Migration has significantly impacted jazz music. Since the migration leads to employment and prosperity for African-Americans, more people can afford to buy records and enjoy music. Subsequently, this has substantially intensified the growth and expansion of jazz music across the American society. Besides, more jazz artists have the opportunity to receive a better education and this results in an improvement in their musical talents. Migration undoubtedly paves the way for the development of music, new cultures, and different forms of jazz music have emerged. As a conclusion, the Great Migration is an impactful historical migration moment throughout U.S musical history. It has also been a great influence on blues and jazz. It has substantially intensified the development of blues and jazz music across the American society as various musical styles and forms have appeared. These musical genres then become a fundamental part of American popular music.