The choir organ was an instrument of Robert Boisseau in the old buffet of Merklin. Several instruments have followed one another in the choir of the cathedral. A Daublaine-Callinet of ten stops in 1839 not powerful enough and sold in 1841 to St Michel at Cordes-sur-Ciel not far from Albi where it remains today and with the addition of a pedal stop. Then a second organ of the same organ maker in 1841 installed on the right side. But its aesthetics and its installation did not suit Viollet-le-Duc, it was thus sold to the Saint-Etienne church in Roanne (Loire). In 1869, they chose a 17-stop Merklin organ with a Gothic case designed by Viollet-le-Duc, installed on the left side of the choir. A 1890 restoration by Joseph Merklin started converting the action to electro-pneumatic and adding combinations, but since the modernization wasn't reliable, Mutin (Cavaillé- Coll's successor) was asked to fix it up. Further work followed (Beuchet in 1938, Hermann in 1953), but the organ never worked properly. (Source: Facebook @Aristide Cavaillé-Coll) 1968 As part of the liturgical space updates and adapting to the new rite, Robert Boisseau delivered a new 28-stop instrument (later expanded by 2 stops) in a French neo- classical style, inspired by Pierre Cochereau. A 16' flute was added to the pedal in 1970, outside the case. The pedal chalumeau was replaced by a clarion in 1989. In 2005, Philippe Guyonnet cleaned it and Bertrand Cattiaux tuned it. In 2010, Bertrand Cattiaux did more work and installed a new console. In 2019, the organ was badly damaged in the cathedral fire on the evening of April 15. The flames spared it, and the pipes didn't melt, but it got completely soaked. Just minutes before the fire, it had been playing for vespers and evening mass. Only the case (designed by Viollet-le-Duc) will be restored and kept. The instrumental part has to be fully rebuilt. The diocese sees this as a chance "to significantly improve the instrument, expand its repertoire, and project its sound better into the nave." To do that—and given the tight space in the case—they've decided to add one or more extensions in the choir gallery. The plan is to build it upward with vertical pipes that will be visible (modest, simple, and discreet) and partly hide the architectural view of the galleries. Today, an electronic substitute (Allen) is in place.