When you sing with a group of people you learn how to subsume yourself into a group consciousness because a capella singing is all about the immersion of the self into the community. That's one of the great feelings - to stop being me for a little while and to become us. That way lies empathy the great social virtue.
I'm in prison. But my heart and mind is free. Gangsta haters on the streets are doing more time than me. They need 30 police escorts with them every time they walk down the street.