Family Choir sings three Sundays per month at the 10 am Eucharist. A warm-up/brush-up is held at 9:30 am, and a one-hour rehearsal is held, following the Eucharist, at 11:30 am. Although singers are not required to be able to read music, they must have a good ear and be able to learn music quickly. The music that Family Choir sings is intended to be accessible to everyone: not too difficult, and yet effectively inspirational.

St. Cecilia is known as the patron saint of music. The St. Cecilia Singers, who sing on the last Sunday of each month, September through June, (plus Christmas Eve and Easter) specialize in singing the big guns, i.e. music from the standard choral repertory. Their music is more difficult and vocally demanding than that of the Family Choir, and singers must be able to read music and be able to learn their music on their own. Rehearsals are held at 9:15 am on the Sunday that the St. Cecilia Singers are singing in church, followed by the 10 am Eucharist, followed by a rehearsal at 11:30 am for upcoming months services.

Future plans for music at St.Thomas include a Mens Choir that will sing twice a year, and the revival of Cherub Choir, made up of children grades 3 7. Children in grades 7 and above are welcome to sing in Family Choir.