• 1864: Émile Poirier & Nicolas Lieberknecht
• 1889: Eugène Puget
• 1897: Jean-Baptiste Puget
• 1992: Restauration Jean-Loup Boisseau & Bertrand Cattiaux

In 1775 the organ of the basilica of Notre-Dame la Daurade was sold to the cathedral of Pamiers.

A few years later, in 1815, the parish bought the Longages organ for the sum of 6,000 francs, and Campardon undertook to build an organ using this instrument for the Positif, Récit and Pédale manuals.

In 1819, Antoine Peyroulous was commissioned to build the Great Organ keyboard of the previous organ for the sum of 15,500 francs (Campardon asked for 18,000 francs!) This instrument, whose dimensions are unknown to us, did not give satisfaction for very long, since in 1861 the Fabrique commissioned Émile Poirier and Nicolas Lieberknecht to rebuild the organ.

The instrument was received on 28 January 1864 by Debat-Ponsan fils (organist of Notre-Dame la Daurade), Joseph Leybach (organist of Saint-Etienne), and Auguste Massis (organist of Saint-Sernin). It was L. J. A Lefébure-Wély who inaugurated the organ on 18 February 1864. In 1866, Debat-Ponsan fils died, and Georges Debat-Ponsan, aged 14, was appointed provisional organist, and was made a permanent member in 1873. The organ was then restored by Eugène Puget in 1889 and re-inaugurated by Georges Debat-Ponsan.

In 1897, the Recit and Pedal manuals were tubularised by Jean-Baptiste Puget at the request of the incumbent. Finally, in 1947, Maurice Puget carried out repairs and modified some of the stops of the Positif and the English horn of the Récit. The complete restoration of the instrument was entrusted in 1990 to the organbuilders Jean-Loup Boisseau and Bertrand Cattiaux, with a return to the original layout. This work was inaugurated on 3 and 4 October 1992 by Michel Bouvard, Jean Boyer, Jan Willem Jansen and Philippe Lefèbvre.

This organ is today one of the most beautiful representatives of the so-called transitional organ building, with stops coming from the great French tradition of the 18th century: large full stop, large reed chorus, cornets (the one in the GO has its 8' open rank), together with those which already make up the romantic organ: gambes, salicionals, harmonic flutes; one can still note a Récit keyboard with a bell, while the two main keyboards are still cut to the tone, as well as some stops typical of this construction: Euphone and Cor Anglais with free reeds. The instrumental part of the Great Organ was classified as a Historic Monument on 20 February 1979.