St. Mary's Choir in Arlington is part of a music ministry affiliated with the Royal School of Church Music.

St. Mary's Choir in Arlington is part of the St. Mary’s Music Ministry, which is composed of six choirs and is affiliated with the Royal School of Church Music. Individuals interested in participating in one of the choirs can contact Gregory Hooker, Minister of Music. The music ministry offers various musical services and events throughout the year, including Choral Evensong services, an organ recital celebrating the completion of the Lively-Fulcher Organ and the 100th Anniversary, the All Saints Choral Requiem with choir and orchestra, Advent Lessons and Carols, an Epiphany Procession, Choral Eucharist on the Eve of Candlemas, and Sung Compline performed by St. Mary's Schola. These musical offerings often feature works by notable composers and are sometimes followed by receptions in locations such as the Merrow Fellowship Center, Paca Hall, or Paca Parish Hall.