3. The words of early blues songs often consist of a single line repeated two or three times before changing.

早期布鲁斯音乐的歌词常常由重复两三次才变化的单行歌词组成。

consist of : make up, contain, include

4. "The moment I heard it ,"he said ,"I knew it was a completely new kind of music."

"我一听到这首曲子"他说，"我就明白它是一种全新的音乐。"

The moment 具有连词功能，意思是"一......就......"

III. 文化背景知识

Musicians, singers, and related workers

Musicians, singers, and related workers play musical instruments, sing, compose or arrange music, or conduct groups in instrumental or vocal performances. They may perform solo or as part of a group. Musicians, singers, and related workers entertain live audiences in nightclubs, concert halls, and theaters featuring opera, musical theater, or dance. Although most of these entertainers play for live audiences, many perform exclusively for recording or production studios. Regardless of the setting, musicians, singers, and related workers spend considerable time practicing, alone and with their band, orchestra, or other musical ensemble(全体演出者).

Musicians often gain their reputation or professional standing in a particular kind of music or performance. However, those who learn several related instruments such as the flute and clarinet, and who can perform equally well in several musical styles, have better employment opportunities. Instrumental musicians, for example, may play in a symphony orchestra, rock group, or jazz combo one night, appear in another ensemble the next, and work in a studio band the following day. Some play a variety of string, brass, woodwind, or percussion instruments or electronic synthesizers(电子合成器)

Singers interpret music, using their knowledge of voice production, melody, and harmony. They sing character parts or perform in their own individual style.