London and installed in June 1841. Of two manuals and 23 stops, it was the largest organ in Australia until its destruction by fire in 1865. In 1942 a pipe organ built by Joseph Howell Whitehouse of Brisbane, (1874–1954), was installed in the gallery at the end of the nave, above the main door. Between 1959 and 1971 Ronald Sharp (b. 1929) installed an electric-action pipe organ in the triforium gallery of the sanctuary, but this was never completed. This is only used for the weekly Novena Mass in the Lady Chapel. In 1997 a new pipe organ was built by Orgues Létourneau of Saint Hyacinthe, Quebec, and installed on a new gallery built around the rose window in the western transept. It was completed in 1999 and dedicated by Cardinal Clancy. The Létourneau organ is of three manuals and 46 stops. In addition to being played from the gallery, it may be played with the Whitehouse organ, from a four-manual mobile electronic console located at floor level. There is a Rodgers digital organ in the quire, which accompanies the daily choral liturgies. There is an organ in the crypt, made by Bellsham Pipe Organs (1985), which is used for liturgies within the crypt. Choirs There are two choirs that sing liturgically at the cathedral. The Cathedral Choir sings almost daily. There is also a voluntary adult choir, the St Mary's Singers, which sings regularly for services and occasional concerts. St Mary's Cathedral Choir Begun in the 19th century as a mixed voice choir, the St Mary's Cathedral Choir has been a traditional English-style cathedral choir of men and boys since 1955. There are usually 24 choristers (boy trebles and altos) and 12 lay clerks (professional countertenors, tenors and basses). The choir sings Mass and Vespers daily (excluding Friday) and is the oldest continuous musical institution in Australia. They perform works ranging from Gregorian Chant, Sacred Polyphony and Renaissance compositions to 21st century compositions. Cathedral Scholars Choristers from the Cathedral Choir whose voices have broken continue their training as part of this special ensemble. The Scholars sing Vespers and Mass on Wednesdays and Saturdays. St Mary's Singers The St Mary's Singers is an adult choir of volunteer mixed voices which sings for Vespers and Mass on the third Saturday of every month, as well as at other liturgical occasions, and gives regular concerts. Organists 1834–35 J. de C. Cavendish 1839