Of all the varieties of music which fill our concert halls, theaters, and nightclubs, only

jazz is native American music. Symphonies and concertos, the ancestors of movie and television scores as well as of 'serious' or 'legitimate' electronic music, were first composed in Germany. Musical comedies descended from opera, which was first performed in Italy. And our ever-popular nightclub singers are the musical heirs of the French singers of chansons.

The one form. of music which did not originate in Europe and which is popular today worldwide is jazz. Jazz was born in New Orleans, the child of the Blacks. It drew on the rhythms as well as the emotionalism of the African music of the Black ancestors, which had been transformed into ragtime and the blues. Improvisation was an indispensable element. Musicians were permitted, in solo performance, plenty of freedom to play in whatever variations just as their creative mood happened to lead them along. But during the Swing era(1930s—1950s), impromptu renditions gave way to arrangement. It was a period when jazz had its widest popular appeal with the big bands that boasted of such outstanding bandleaders as Duke Ellington, Glenn Miller and a whole galaxy of top-notch instrumentalists.

Rock music in the 1960s is a sociological expression rather than a musical force and the rock arena was seen as a sort of debating forum, a place where ideas clash and crash, where American youngsters struggle to define and redefine their feelings and beliefs. Bob Dylon touched a nerve of disaffection. He spoke of civil rights; nuclear fallout, and loneliness. He spoke of change and of the bewilderment of an older generation. "Something's happening here," he sang. "You don't know what it is, do you, Mr. Jones？"

Others entered the debate. The Beatles urged peace and piety with humor and maybe a little of help from drugs. Feelings, always a part of any musical statement, were a major subject. Elvis Presley became the pop icon, maybe because he acted out your wildest fantasies, brought out your subdued id, embodied your frustrated teenage spirit, and encouraged your protest against traditional values. In this sense, rock is the music of teenage rebellion. All aspects of music—its exciting offbeat, loudness, self-absorbed lyrics and raving delivery—indicated a defiance of adult authority.

What is the best title of this passage？______

A．The origin of jazz

B．The success of rock music

C．The contemporary jazz and rock

D．The musical development from jazz to rock