Following the Civil War, Black Americans, through employment as musicians playing European music in military bands, developed a new style of music called ragtime which gradually evolved into jazz. In developing this latter musical form, African Americans contributed knowledge of the sophisticated polyrhythmic structure of the dance and folk music of peoples across western and sub-Saharan Africa. These musical forms had a wide-ranging influence on the development of music within the United States and around the world during the 20th century.
The earliest jazz and blues recordings were made in the 1920s. African-American musicians developed related styles such as Rhythm and Blues in the 1940s. In the 1960s, soul performers had a major influence on white US and UK singers. In the mid-1960s, Black musicians developed funk and they were many of the leading figures in late 1960s and 1970s genre of jazz-rock fusion. In the 1970s and 1980s, Black artists developed hip-hop, and in the 1980s introduced the disco-infused dance style known as house music. In the 2000s, hip-hop attained significant mainstream popularity. Modern day music is heavily influenced by previous and present African-American music genres.
As well as bringing harmonic and rhythmic features from western and sub-Saharan Africa to meet European musical instrumentation, it was the historical condition of chattel slavery experienced by black Americans within American society that contributed the conditions which would define their music. Many of the characteristic musical forms that define African-American music have historical precedents. These earlier forms include: