The Cathedral has a large organ that was originally built by Geo.
Kilgen and Son, Inc., in 1915.
Originally, the organ had two four manual (keyboard) organ consoles, one in the gallery with the organ, and another console behind the sanctuary.
In 1946, Kilgen put a new organ into the Cathedral.
The 1946 organ had 77 ranks of pipes, 14 of which came from the older organ.
In 1948, an Echo Organ from Carnegie Hall, New York City was installed in the Cathedral.
In 1984, the M. P. Moller organ company refurbished the organ.

In 1997 the Wicks Organ Company of nearby Highland, Illinois, began a restoration project.
They added more ranks of pipes, which brought the organ to 96 ranks of pipes.
The company also added some digital stops to the organ.
A new four-manual organ console replaced the old Kilgen console behind the sanctuary, and the second gallery console was refurbished.
Wicks also updated the organ's electronics.

In the winter of 2002 the gallery organ was expanded, and a new dome division of pipes was added to the organ.
The final step in the project, the replacement of the original gallery console (and a smaller, two-manual console that took its place) with a five-manual console was completed in 2010.
The Ragen Organ Console, named for its donor, Professor Brian Abel Ragen, was taken from St. Bartholomew’s Church in New York City and completely restored.
It is now possible to control every part of the organ from either the gallery console or the moveable sanctuary console.

The original Kilgen console was moved into the basement museum, and can be viewed by visitors.
The gallery organ is featured on many of Saint Louis's cultural tours.
The Cathedral has a large organ that was originally built by Geo. Kilgen and Son, Inc., in 1915. Originally, the organ had two four manual (keyboard) organ consoles, one in the gallery with the organ, and another console behind the sanctuary. In 1946, Kilgen put a new organ into the Cathedral. The 1946 organ had 77 ranks of pipes, 14 of which came from the older organ. In 1948, an Echo Organ from Carnegie Hall, New York City was installed in the Cathedral. In 1984, the M. P. Moller organ company refurbished the organ.
In 1997 the Wicks Organ Company of nearby Highland, Illinois, began a restoration project. They added more ranks of pipes, which brought the organ to 96 ranks of pipes. The company also added some digital stops to the organ. A new four-manual organ console replaced the old Kilgen console behind the sanctuary, and the second gallery console was refurbished. Wicks also updated the organ's electronics.
In the winter of 2002 the gallery organ was expanded, and a new dome division of pipes was added to the organ. The final step in the project, the replacement of the original gallery console (and a smaller, two-manual console that took its place) with a five-manual console was completed in 2010. The Ragen Organ Console, named for its donor, Professor Brian Abel Ragen, was taken from St. Bartholomew’s Church in New York City and completely restored. It is now possible to control every part of the organ from either the gallery console or the moveable sanctuary console.
The original Kilgen console was moved into the basement museum, and can be viewed by visitors. The gallery organ is featured on many of Saint Louis's cultural tours.
Cathedral Basilica of Saint Louis (St. Louis)