在20纪音乐文化的演变中,社会和科技因素所起的作用相当大。它不仅使音乐听众增加了许多,也促进了多种音乐形式的出现与发展。这一现象在美国得到最为充分的体现,其中最伟大的创造就是爵士乐的产生。爵士乐的雏形是19世纪末普遍存在于美国南部的劳苦黑奴工作时所唱的歌曲,这种歌曲是黑奴们对困苦、单调、压抑的生活的情感渲泄,它不仅是一 In the evolution of twentieth century musical culture, social and technological factors play a significant role. It not only increased the number of music listeners, but also promoted the appearance and development of various forms of music. This phenomenon has been most fully demonstrated in the United States. The greatest of these is the creation of jazz. The prototype of jazz was sung in the mid-19th century as the work of the Labor Negro of the South of the United States. This song is an emotional excuse for the niggers in their hardship, monotonous and repressive life. It is not only a