I suppose you could say that today's show is about a fairly obvious truth--singing with other people feels good.
But, it's a little bit more complicated than that. When you go to a church and pick up a hymnal and sing what everybody else sings, it feels okay. And, a fairly complex set of activities takes place in your brain, and that's nice, but it pales in comparison to really singing with others.
That is, getting together with other people and rehearsing and working toward a truly successful blend of voices.