It can be inferred from the article about the impact of electronic media on presidential elections that before 1960 TV had little or no role in the outcome of an election.

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

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