There is no strict definition of a “session”. They are essentially dynamic and organic informal music and social events. They provide an opportunity for traditional musicians and singers to swap ideas, to learn new tunes and songs, to blether, to play and sing together, and to welcome other musicians, singers and all into the fold.
Sessions are inclusive they do not have “artists and audience”, everyone is a participant. Sessions are not concerts or “gigs” (which are usually formal and amplified performances). A session is not a performance; it is a social event with music and song in which everyone can participate. Sessions give visitors to Scotland an authentic experience of Scotlands indigenous musical culture.
Source: Folk music sessions | Bankfoot Inn, Perthshire Hotel