The St Mary's Cathedral Choir is the oldest musical institution in Australia. In 1818 a group of choristers was formed to sing Vespers before the Blessed Sacrament in the Dempsey Household, the centre of Catholic worship in Sydney as a penal colony. When St Mary's Cathedral, Sydney was constructed, the successors of these choristers formed the Permanent Cathedral Choir under the guidance of Catherine Fitzpatrick.All of the boy trebles in the choir are students of St Mary's Cathedral College.
Now over 175 years old, the Choir is formed of approximately forty choristers and sings at High Mass every Sunday and on special holy days, and has gone on many tours and concerts, and sometimes singing with the Brandenburg Orchestra. The choir is a liturgical choir for male voices, boy trebles and adult men.