64. According to the author, music notation is important because ________ .

　　[A] it has a great effect on the music culture as more and more people are able to read it

　　[B] it tends to standardize folk songs when it is used by folk musicians

　　[C] it is the printed version of standardized folk music

　　[D] it encourages people to popularize printed versions of songs

　　65. It can be concluded from the passage that the introduction of electronic media into the world of music ________ .

　　[A] has brought about an information revolution

　　[B] has speeded up the appearance of a new generation of computers

　　[C] has given rise to new forms of music culture

　　[D] has led to the transformation of traditional musical instruments

　　66. Which of the following best summarizes the main idea of the passage?

　　[A] Musical instruments developed through the years will sooner or later be replaced by computers.

　　[B] Music cannot be passed on to future generations unless it is recorded.

　　[C] Folk songs cannot be spread far unless they are printed on music sheets.

　　[D] The development of music culture is highly dependent on its material aspect.