M P Moeller Inc. of Maryland, USA, built the pipe organ installed in 1928 to the side of the gallery. The Sydney organ consultant, Joseph Earnshaw, wrote soon afterwards:
By selecting such a fine instrument the perfectionist Mother Xavier showed that she would have agreed with the Second Vatican Council, when it decreed that the pipe organ is to be held in high esteem, for it is the traditional musical instrument that adds a wonderful splendour to the Church's ceremonies and powerfully lifts up the spirit to God and to higher things.