from This Rock
Q: "One of my friends suggests that we should not applaud the choir after the closing hymn. He says that the song should direct souls to the Lord. I find it unnatural if we don't applaud."
A: The church is not a concert hall and the liturgy is not a performance. We are there to direct our attention to God—not to each other. There is a time and place for everything. The church is for prayer—not performances. If you want to convey your appreciation for the music, compliment the director after Mass.