Opus 786 of E.&G.G. Hook and Hastings was installed in July of 1875 at a cost of $2000 just a month before the opening of Unity Church. It visually dominated the front of the 1875 church with stenciled open diapason pipes in a black walnut case. The wind was powered by a hand pumped bellows for which the pumper was paid $25.00 a year. In 1905, a water motor replaced the pumper with an annual fee to the North Easton Water Works of $8.40. The present Spencer Organ Blower was installed in 1924.

The redecoration of the church in 1895 resulted in the organ pipes being obscured with the organ console protruding through the panel behind the choir. 1902 reports note “long needed repairs,” and in 1905 “changes were made in the organ to lower its pitch.” This was done probably by the Williams Organ Company of Eastondale whose first organ was installed at Immaculate Conception Church on Main Street. A nearly bankrupt Hook and Hastings firm rebuilt the organ in 1934 in their opus 2605, one of the last of that prestigious company. The console was moved to its present location and connected to the pipes via a cable under the floor. The keyboards were enlarged from 56 to 61 notes and the pedal board from 27 to 32. Mary Ames Frothingham donated the $3000 necessary for this work. In 1954 the Aeolian Skinner Company did major revision of the organ adding a three rank mixture which was put over the choir loft and removing the open diapason, melodia, and dulciana from the great. But by the mid seventies the organ was failing badly. Humidity in the cable caused unbelievable cross circuitry. Notes sounded without their keys being depressed and motion of the swell pedal activated certain stops. By 1975 the great was completely unplayable. At this point David Ames and Elise Parker set up an organ repair fund to which the previously paid choir members henceforth donated their weekly remuneration by agreeing to serve without pay. In 1978, organist Richard Hill along with Robert and Richard Lahaise redesigned the organ returning most of the 1933 Hook and Hastings stops and retaining the mixture. Bob Lahaise died of cancer before the work was completed and Richard, who continues to maintain the organ finished it. 

Unity Church Organists