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In fact, there was hardly any activity or social event that could not be set to Music. Wed
After the American Civil War (1860-1865), the Negroes had gained their freedom and were ready【22】a new type of music,【23】that would preserve their musical traditions but be fast and happy【24】their【25】freedom. They wanted something they could play as professional musicians for both black and white audiences. Jazz was the answer. It combined themes from Negro work songs, spirituals and blues, set to a fast beat,【26】the musicians improvising (即兴而作) as they went along, like the funeral marching bands. To be good, a musician had not only to remember his part but also【27】able to invent new variations on the spur (激励) of the moment.
Jazz【28】the people, but popular【29】is changed many times in form, style, and tempo. Each change added something【30】.
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A.which
B.that
C.all
D.those
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