5,000
Given the long history of opera covering a few hundred years and the thousands of operas [quite a few 'lost'] written [and variations etc] the question is too broad to enable an answer to be given. The problem is compounded as to what constitutes a 'Chinese song' and how far back one would go. An example to illustrate is John Adams opera 'Nixon in China'. The opera begins at Beijing Airport and a detachment of Chinese troops marches onto the stage singing a 1930s Red Army song.
In Beijing about 1790. There are numerous regional branches of Chinese opera, of which the Beijing 'Jingju' opera is one of the most notable. Also known as Peking Opera [Beijing opera] is a form of traditional Chinese theatre combining music, vocal performance, mime, dance and acrobatics. The links below go into detail -
How far back does family go back
They had many differences. One of their differences was how they spent their leisure time. They played board games. Go was for the higher class and Chinese Chess or XianQi was for the lower class. There was also Chinese Opera. Chinese Opera was for only higher class people because they could afford to go and watch.XianQi- another way of saying Chinese Chess.
They can go back as far as they wish. They get to determine the perimeters of the background search.
as far back as he wants to
There is no cut off date. They can go back as far as they wish.
They will go back as far as they can. There is no limitation and all criminal activity will be found.
No way of telling - each employer can be different - they can go back as far as they want.
As far back as the application says. If unsure, go back 7 years.
At least as far as ancient Greece