How to Tell When the Choir is Doing a Good Job

I've been playing with a folk choir these past couple of months, and because of the style of the church, I can see nearly everyone in the assembly from where the choir stands. The people in this parish really make an effort to sing, which is a good thing--I even saw the altar servers singing the psalm response and the acclamations.

But you really know that the choir is doing its job of Leading the Assembly in Praising the Lord when you look at the people during the "Alleluia"--and many of them are singing their hearts out, with smiles on their faces.