The modern genres of blues and ragtime were developed during the late 19th century by fusing European musical styles (characterized by diatonic harmony within the framework ofequal temperament) with those of Africanorigin which employed the natural harmonic series and blue notes. The exceptions are hip hop, house and techno, which were formed in the late 20th century from earlier forms of African-American music such as funk and soul. Modern day music is heavily influenced by previous and present African-American music genres.
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 sophisticatedpolyrhythmic 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.
