The chamber choir consists of twenty-five members. Previous choir experience is usually a requirement for membership as choir members are screened carefully. Since it co-exists with a much bigger school choir, the more mobile chamber choir performs more often in churches and on special occasions like festivals. Therefore the repertoire, although it includes popular music, offers ample opportunity for serious choristers to develop their ability to produce beautiful sounds in harmony.

The main choir practices take place on Monday afternoons, and Wednesday breaks, but special programmes necessitate extra practices, which may take place before school or during other breaks.