Music-making Together?

The uncertainty over communal music-making at this time throws up questions on music's power to touch lives, questions on the ways in which music improves wellbeing. Is it the music itself or the opportunities it creates to interact with others? Is hearing or performing music alone equally beneficial as gathering with others to listen or to play?
How differently do we respond to music alone or with others? Is singing more dependent on community than playing an instrument would be? How are participatory groups and choirs to weave together different needs?