What was the function of the Bayan at the early pagan/Christian courts?

Question

Bayan was an air harp and was used in Russia around 900 AD,

Answer 1

The Bayan was a large drum that was sounded at the beginning of pagan courts.. It was thought that the deep sound of the drum would drive away any evil spirits, prior to the court proceedings. It also served as an announcement that the session was ready to begin.