The Brindley and Foster tracker action pipe organ in St Peters Church, installed in 1880, was the first of three such instruments known to have been sent to New South Wales.

Of the other two, the instrument installed in All Saints' Anglican Cathedral, Bathurst in 1886 has been substantially rebuilt, but the third organ, installed in St John's Anglican Church, Mudgee in 1881, like its counterpart in St Peters, has continued without alteration.

These organs are noted for their clarity and brilliant sound, reflecting both the French influence of the younger partner, Healey Foster and the German skill of Edmund Shulze, who taught Charles Brindley organbuilding prior to 1854 and the opening of Brindley's business in Carver Street, Sheffield, England.

The organ has two 4-octave manuals, the swell manual being situated above the great manual, and a two-octave pedal board.

The swell organ offers 5 stops and has an Oboe as its solo stop rather than the more common Trumpet. The combination of the reeds and pipes give the swell organ a delicate and haunting quality.

The great organ has 6 stops. The usual robust 8' diapason is complemented by a mixture of 8' and 4' stops to add colour including a 12th and 15th Grave mixture to add brilliance.

The pedal organ comprises a single 16' sub bass stop.

Couplers are available to slave the swell manual to the great manual and to slave either or both manuals to the pedal board.

The organ underwent an extensive overhaul a few years ago to restore its mechanical parts to full working order, however traditional materials were employed and great care was taken not to alter the sound, which is outstanding for an organ of its size. The one concession to modernity over the years has been the installation of an electric blower to relieve parishioners of the effort of pumping the bellows by hand. This, of course, has not affected the timbre of the instrument in any way. The pump handle and the stool where the unfortunate operator sat can still be seen on the North side of the air intake at the back of the organ.