Etiquette is musical sensitivy. Needs to be acquirec. When it's not there, it's a lost cause. Solution? 1. Small groups of people that are comfortable and know one another musically. (Maybe have met together more than once). 2. Folkies who have been trained to play and jam together like jazz musicians. 3. Singarounds which in my view are not jam session but mini-concerts.

There is a crying need for classes or training in ensemble playing in all kinds of music.

Frank Hamilton