numbered musical notation造句

What does the dot under a number in the numbered musical notation mean?

At present, because of lacking perfect music score, most of the songs are published by numbered musical notation.

Shaanxi Operas numbered musical notations and gong and drum scriptures are the important symbols of meaning and form, which imply the traditional agro-farming culture.

It is a creative trial of the Jia Ping′ao′s novel titled "Qin Opera" that the music of Qin opera is written into a novel with numbered musical notations and classics of gong and drum;