Dear Worship leader/song leader/service leader (whatever name your tradition allocates to the person who gets the congregation to sing during a church service),
I have a request. Probably a gripe, really. Maybe even a touch of nit-picking. Please indulge me and forgive me if I walk on your toes.
Next Sunday (or during the week if you are involved in one of those summer special events) please think twice before you thank your congregation for singing well. They are not singing for your benefit: unless your church service is an ecclesiastical version of a talent show and you are the ecclesiastical version of Simon Cowell.
They are singing for an Audience of One (and it is not you).
By all means encourage them. But remind them who is listening.