【单选题】

"Is jazz a kind of folk music Is it a performing style How is it different from other kinds of music " There is no simple answer to these questions, because the most important quality of jazz comes from its unique combination of different musical sources over a period of almost 400 years.

The quality that unites the many different jazz forms is, in some degree, separate from its musical sources. That quality is the expression of freedom. The idea of freedom is central.
The ancestors of jazz were black people from WestAfrica who were brought toAmerica as slaves, or forced laborers, from the early 1600s to the mid-1800s. Most of them remained slaves until President Lincoln set them free on January 1,1863, during theAmericanCivil War.
With the loss of their personal freedom and the breaking up of their families, the slaves also lost the social traditions of their music fromAfricA、The complex rhythms (节奏) of this music involved a number of people performing together. The breaking apart of these social groups forced slaves to create new songs, that is, to develop a completely new musical tradition.
Using some of the rememberedAfrican rhythms, the slaves gradually began to add some features of theEuropean classical music that was played by the slave-owners. The slaves were also influenced byAmerican folk songs.But the result of adding these borrowed elements to the complexAfrican rhythms was the beginning of a completely new kind of musiC、Still, this music only existed privately among groups of slaves.
The salves’ work had another effect on their musiC、It introduced new kinds of musical rhythms. Some of these rhythms became work songs to accompany their planting and picking of cotton. Other rhythms were developed by teams of workers who needed to lift heavy loads of cotton onto carts that passed through the fields. Later, during the building of the railroads, individual workers created new songs to match the sharp rhythms of steel as they put the rails into place.
Which of the following statements is NOT true
[A] The ancestors of jazz music were ’free black people.
[B] Jazz music has mixed different kinds of musical sources.
[C] Some of the rhythms of jazz music later became work songs.
[D] It took quite a long time to develop jazz musiC、