Choir is an elective for grades 6 - 12. Middle school choir (grades 6-8) and high school choir (grades 9-12) combine with the bands to present a Christmas Concert each December, a Spring Concert each May, and the combined choirs perform at Grandparents' Day in November.
Students in both middle school and high school choir have the opportunity to participate in auditions for the Texas Private Schools Music Educator Association Honor Choirs.
One Voice is the ACS Pop Choir, an audition-only elective. In addition to the bi-annual concerts, One Voice and the high school choir also participate in a Director's Choice Festival each year, and One Voice makes frequent appearances at school and community events.