The octagonal drum (pinyin: bā jiǎo gǔ) is a kind of slap-membrane musical instrument used by the Manchu people for self-entertainment in ancient times. The drum body is flat and small, and the drum surface is octagonal, representing the Eight Banners of the Qing Dynasty at that time. The drum frame is made of eight pieces of ebony, red sandalwood, mahogany, rosewood and bone pieces; it is said that the leaders of the Eight Banners each offered a piece of the best wood inlay. Two to three small copper cymbals are embedded in each of the seven sides of the frame, and one side is inlaid with studs and drum spikes, implying the abundance of grains. It is a traditional form of folk art that is popular among the people.

Bai folk instrumental music mainly includes sanxian music, suona wind and percussion music, cave scripture music, etc. In addition, there are also ancient music and tunes played by bamboo flute, mouth spring, wood leaf and so on.

When the children of the banner members of the Qing Dynasty organized the box office to sing the octagonal drum, they also included some other folk arts and acrobatic forms, which were called "quantang octagonal drum", or octagonal drum for short. Waist festival, horse head tune, demolition singing, cross talk, ancient color tricks, etc. It was extended to the Jiaqing and Daoguang years, and songs such as Danxianer and Xiyun were added.

The demolition and singing of the octagonal drum was formed in the middle of the Qing Dynasty. Also known as "Brand Song Singing", "Octagonal Drum Band Small Opera", "Brand Opera".

In the long river of traditional opera in Beijing, the octagonal drum is a folk art that is as famous as the Beijing-style art such as Chaqu, Beijing rhyme drum and single string.