Each time I meet with the church choir, we end with this prayer I learned while working as a chorister at a large Episcopal church in Dallas, TX. I have amended it slightly to take some of the archaic language out, but I think it's a wonderful way of viewing music ministry.
The Choristers' Prayer
Bless us your servants who minister in your 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.
The Choristers' Prayer is attributed variously to Sir Sydney Nicholson, the Royal School of Church Music's founder or to Cosmo Lang, Archbishop of Canterbury (1928-42)