Jazz is a kind of music characterized by swung and blue notes, call and response vocals, polyrhythms and improvisation. Though originally a kind of dance music, jazz has been a major part of popular music, and has also become a major element of Western classical music. Jazz has roots in West African cultural and musical expression, and in African American music traditions including blues and ragtime, as well as European military band music. Early jazz was closely related to ragtime, with which it could be distinguished by the use of more intricate rhythmic improvisation. The earliest jazz bands adopted much of the vocabulary of the blues, including bent and blue notes and instrumental "growls" and smears otherwise not used on European instruments. Jazz's roots come from the city of New Orleans, Louisiana, populated by Cajuns and black Creoles, who combined the French-Canadian culture of the Cajuns with their own styles of music in the 19th century. Large Creole bands that played for funerals and parades became a major basis for early jazz, which spread from New Orleans to Chicago and other northern urban centers.