The RSCM have written a wonderful short prayer, known off by heart by most choristers in the UK (and presumably internationally!).
Bless, O Lord, us Thy servants, who minister in Thy temple.
Grant that what we sing with our lips, we may believe in our hearts, and what we believe in our hearts, we may show forth in our lives.
Through Jesus Christ our Lord. Amen.
I have been saying this prayer since a young age, and it resonates with me deeply. In my setting of the Choristers’ Prayer, I have attempted to capture some of my feelings about it.