单项选择题Which of the following best summarizes the main idea of the passage
单项选择题According to the author, music notation is important because _________.
单项选择题It can be learned from this passage that _________.
单项选择题Research into the material culture of a nation is of great importance because _________.
单项选择题It can be concluded from the passage that the introduction of electronic media into the world of music _________.