Music comes in many forms; most countries have a style of their own. 21 the turn of the century when jazz (爵士乐) was born, America had no prominent 22 of its own. No one knows exactly when jazz was 23 , or by whom, but it began to be 24 in the early 1900s. Jazz is America"s contribution to 25 music. In contrast to classical music, which 26 formal European traditions, jazz is spontaneous and free-form. It bubbles with energy, 27 the moods, interest, and emotions of the people. In the 1920s jazz 28 like America, and 29 it does today. The 30 of this music are as interesting as the music 31 . American Negroes, or blacks, as they are called today, were the jazz 32 . They were brought to Southern States 33 slaves. They were sold to plantation owners and forced to work long 34 , When a Negro died his friends and relatives 35 a procession to carry the body to the cemetery. In New Orleans, a band often accompanied the 36 . On the way to the cemetery the band played slow, solemn music suited to the occasion. 37 on the way home the mood changed. Spirits lifted. Death had removed one of their 38 , but the living were glad to be alive. The band played 39 music, improvising (即兴表演) on both the harmony and the melody of the tunes 40 at the funeral. This music made everyone want to dance. It was an early form of jazz.