Jazz is the true American musical art form.
Jazz originated in the United States of America. After the American Civil War, in the area of the Mississippi Delta, around New Orleans, Louisiana, American Negroes aboard wagons in funeral processions on the way to the burial site played songs slowly and somberly, but on the way from the burial site they played the same songs lustily and lively. The lively and lusty nature of these performances was exciting, and quickly caught on as entertaining and interesting. Jazz musicians thus became celebrities. But then the musicians got interested in improvisational nature of the fills.