The organ in Bähr’s Frauenkirche was installed in 1736 and deemed one of the greatest works of Gottfried Silbermann. Johann Sebastian Bach gave a concert on it shortly after its installation. However, by 1769 the organ was retuned for the first time. A further retuning was carried out in 1819, because the organ, which was developed for the sound of baroque chamber music, stood ‘a half a tone too deep in relation to the present instrumental ambience’. Also in the period that followed, the organ was expanded several times and restructured so that its original sound form has not been handed down. The organ together with the organ case was completely destroyed in 1945.
 
The new organ was built in 2005 by Kern, an organ-builder from Strasbourg. It impressively combines the organ building principles of the brothers Gottfried and Andreas Silbermann. The instrument is tonally enriched by the typical sounds of a French romantic organ work, so that the new organ possesses an impressive versatility. As a result, the organ works of Johann Sebastian Bach can be played just as authentically as the symphonic organ works of César Franck. The extremely adaptable instrument possesses 69 sounding stops which are distributed over four keyboards and one pedal. Of the 4,876 pipes, of which only a small part is visible, the smallest measures less the one centimetre and the biggest measures over five meters. 
 
The organ is equipped with the following stops:

Couplers II-I, III-I, IV-I, II-I 16’, III-I 16’, III-II, IV-II, I-P, II-P, II-P, IV-P, III-P 4’ 
Appel I
Transpositeur IV  (415 Hz)
Setting combinations (8192 memory spaces)
Appels des anches I,II,III, P
Stop crescendo variable 
Crescendo Récit