Something about charging money to watch a concert in a Catholic Cathedral strikes me as very wrong. Asking for donations would be one thing as the group in question is registered as a charity. Maybe it's the denying entrance to those who do not pay, when there should never be a door charge to enter a place of God. Then there's the questionable concept of using the sacred place for a concert when it ought to be a place of prayer. Yet the concert has a very religious theme that could create a prayerful atmosphere ...
I don't know, maybe someone can help here. The whole thing just strikes me as improper.
Related Link: Festival Singers Next Concert - Stabat Mater