St. Stephans has one of the largest pipe organs in Europe. There are three different keyboards used to play this pipe organ. The sounds of a mighty organ on the west gallery of St. Stephen’s Cathedral in Vienna once again fill the interior of one of the world’s most beautiful churches. The giant organ (130 stops), which had not been playable for 25 years, has now been restored by the organ building company Rieger and connected to the choir organ (55 stops) at the front of St. Stephen’s Cathedral, which was also built by Rieger in 1991. Both instruments can now be played not only from a mobile central console in the nave but also from a second central console in the gallery. The connection of the two organs makes it possible, for the first time in the history of St. Stephen’s Cathedral, for the sound of the new organ to fill the whole of the interior, with its volume of 100,000 cubic metres (3½ million cubic feet – larger than London’s Royal Albert Hall), from a central console with five manuals and now a remarkable 185 stops.