It's a very friendly song circle at a really neat location. That song was the first one of the evening as I recall, so some of the other players were just kind of warming up, and you don't hear much noticeable playing from them in the clip. It's the kind of thing where one person at a time does a song going around the circle. Other people may join in, but not so loud as to override the sound coming from the person whose turn it is.