The saying is "Preaching to the choir."
"preaching to the choir" means, basically, that you're scolding the wrong person, or informing someone of a fact that they are already well aware of. ie: the preacher is telling a group of people who are already well-versed in their religion, about its consequences and/or virtues.
"Whistling into the wind."
Both are used, but "massed choir" removes the confusion with a choir singing a mass.
The church choir sang beautifully during the Sunday morning service.
The noun phrase 'my favorite singing group' is a common noun.A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'singing group' is the name of a singing group, for example, The Rolling Stones, The Beatles, or the Mormon Tabernacle Choir.
Choir/gospel choir
There will be a choir singing in church on Sunday.
A Choir Director or professor.
A 'Choir' are a group of singers singing songs. Therefore a church choir are those members of the congregation who come together to practice singing the church music so that they can lead the congregation in singing praises to god.
Yes, Laura Ingalls Wilder was a member of the church choir in her community. She enjoyed singing in the choir and found comfort and joy in singing hymns with others.
singing
Practice singing, try out for the choir, and accept if offered a spot.