Things People Should Maybe Not Do When Singing Songs In Church/Public Places In General:

1) It may be wise to refrain from pretending you are Sarah Brightman singing something from Madame Butterfly. Your delusions that you are an opera singer tend to spoil the nice prettiness of simple church songs ... if you really want to attempt vocal gymnastics, get a stage ... preferably far, far away from me.

2) Try not to HARMONIZE and disconcert everyone in the damn pew with your very odd deviations from the nicely composed set score. Okay thanks.